What is the cheapest way to acquire 1000 games?

The Steam Group 'epicbundle' http://steamcommunity.com/profiles/76561198049412986/groups/

is pretty good place for all deals.

I've been using this tracker since I joined Steam.
There are also numerous groups on Steam dedicated to letting you know about bundles, deals, and freebies. If you join a few of them, there's no way you'll miss anything.

http://www.epicbundle.com/

Also alerts you of free games and what not

http://isthereanydeal.com/

for deals and sales

http://www.enhancedsteam.com/

For when your browsing the steam website

Bundles are the quickest way,though sales can help also and you will need to use both

Also depends on if you just want 1000 games and do not care what you get to get there,if your going for quality over just grabbing anything that you can,then that might take awhile

Trading is another good option if you just want to add as many games as you can,trade the doubles you have for ones you do not have

Traders Guide Group can help with that and other groups though this is the one i use most
https://steamcommunity.com/groups/TradersGuild

anyhow i hope this helps and gets you to 1000 quicker

Depends on your country, some games do require a bit of time, but you can just watch a movie in a different window while doing them.
There are also tasks ranging from good paying to low paying but it depends on where you live.
Just like there is no real getting rich quick scheme there is no getting a 1000 games quick thing either, i got more then 1000 games just by Tremor but it took a good year.
You either invest your own money and then are better off with bundles, but if you don't have alot or want to spend much on it then Tremor is good but then you have to invest time.

isthereanydeal.com will help you

You're bored of playing games, so you plan to buy mass amounts of a thing that bores you. Not to mention these cheap games that you'll fill your account out with are going to be really bad most of the time, so when you do go back to play them, you'll just get bored again. Buy good games, play good games. That's it.

Not if you're good at hiding your tracks

"joking"
rrrriiight, I get it ;)

you can trade the games here for keys/gems

buying bundles would be cheaper, and don't forget you can trade the extra keys from the bundles you bought for other games

you can also find cheap games from previous bundles in tremorgames.com, they have games for 99 coins (which you can get from trading in 2-3 trading cards )

I know I used to sell a lot of surplus bundle games for trading cards, etc and plenty of other people were doing the same thing. But strangely not many people are selling stuff for less than they bought it. So generally it is cheaper to buy bundles than trade for them. Just trade if you only need one or a few games from a bundle to save buying the whole thing.

Well, considering you only entered a grand total of 21 GAs it would be weird if you'd win 100 of them :D:

Really hope you aren't gonna fill your collection like that though unless you will actually play them.

well, zelgh is only a few games short of 1000 wins... so it is indeed a legit way of getting there!

go on and try :D: EyEBURNeR was my only actual competition, but I jumped over him thanks to SimGive event :D:

When you are first starting your collection, yes. As your collection begins to grow, it will become harder and harder to find traders who have something that you don't already own. Since you are just starting out though, I do not believe this will be an issue for you until you long pass the 1k mark.

I should point out that you should first start trading with peeps with large amount of rep (~+100) since most will require you to go first as a means of protecting themselves and they are unlikely to scam you. Rep is a precious commodity that few seasoned traders would be willing to throw away for cheap bundle games.

If you have any more questions, feel free to ask :D. I was in your spot not too long ago so I know how this all feels XD.

Cjcomplex nailed it pretty good. Just one personal clarification from me: +rep on SG is a more valuable commodity than +rep on a Steam profile as I just visited the Indiegala Steam group and I've seen that people are actively posting on the Indiegala wall things like " + rep for +rep " and I've seen also postings like " 50 gems for a +rep " and a Russian posting " for a donation " he would " +rep any of 10 different kinds of +rep " like fe +rep good trader or +rep Awesome trader etc.... So these morons are clearly posting +rep on each others Steam profile just to boost their Steam profile " as shiny as can be"; but it's fools gold...

I tried entering so many giveaways at lvl 0 and won nothing and got frustrated. I then realized that any giveaway you do no matter if it's a game you bought for 1 cent or 20 dollars will give you lvl 1. The best place to enter giveaways are the ones here on the forums because they give you a lot better chances to win than the public giveaways. However a lot of the giveaways on forum require at least lvl 1. Additionally to block leechers I.E. people who come here simply to get games with no intent of giving back, a lot of people set giveaways to lvl 1. Therefore it would be in your best intrest to go on steam and get something like this game which is 14 cents and purchase it as a gift. Then after that create a 1 hour giveaway here on SG and that will get you lvl 1 in about an hour along with better odds of winning and having more giveaways that you can enter.

edit sent you an invite on steam i'm ROTN.Meliodas

+1 He's a hunk, I'd hire in a heartbeat.

This stereotype, they now carry their husbands credit cards.

^Exactly. Money isn't really the issue. I'd just like for it to be cost-efficient.