best 2 -3 € steam games to giveaway

Battleblock Theater is on sale for that price.

My personal favourite would be recettear (a bit over the price you say but great game!)
Also Ethan Carter and Child of Light are both really nice games.

Tthe Ys games. Yyou can give away some of those. I think some are about 3 € (and fun if people like hack and slash action RPGs, I guesssss).

Brothers: Tale of two son
SteamWorld Dig
Battlefield: Bad Company 2
Fable Anniversary

You just reminded me to buy Commander Keen. Still have them all on Floppy Disks...

but

I have no more Floppy Disk DRIVE. Hmm.

As for Suggestions: Stronghold, Bully, Binding of Isaac, GTA SA, Goat Sim, Dead Space, Garry's Mod, Machinarium, Rogue Legacy, BF BC2.

TIS-100 maybe? :D

Witcher Adventure Game

FTL
Age of Empires II HD
The Stanley Parable
Punch Club
Crypt of the Necrodancer
Goat Simulator
HuniePop