Where do you take gifts for giveaways? Steam?

Hi dDenVill. Yeah if you buy it on Steam you'll need to add the winner, but be aware that there are regional price restrictions so you might not be able to deliver it if your currency is valued less than the winner. I always suggest making it region locked to your area due to that reason.

If you plan on buying it on a steam sale it's best to do it at the start of the sale and make sure the sale is running longer than 7 days because the winner has 7 days after the giveaway ends to claim it.

You are not allowed to mention black market stores in discussions so people can't tell you about those either.

'Where to you take gifts for giveaways?' You mean where people buy the keys to give away here?
If so, I would say IndieGala, Fanatical, Humble Bundle, GreeManGaming, etc. are the legal stores for that.

On steam the price difference is not allowed to be more than 10% and that can differ per game.

These grey market sites are a double edges sword, you never know whether they key you bought was already activated or not. I'd stick to Fanatical, HB and GMG.

Fanatical 99% of the time

You made 334 GAs. From where did you had the keys for the GAs if you don't know how to get keys from stores ?
I am, a bit, confused.

My sources are HB, Fanatical, GMG for 95% of my keys.

A lot of the giveaways are from bundles from sites like Humble bundle and Fanatical. With Humble bundle you'll have to be wary of the regional restrictions, if there are any, on each game. If there is a regional restriction on a key, you can always just limit the giveaway to the proper regions.

If you want to giveaway specific games, you can use a site like gg.deals which tells you what the cheapest prices are across all stores. I wouldn't recommend using an unauthorized retailer/black market site for giveaways in case the key ends up having issues/being revoked.