Your First Steam Purchase

Call Of Duty: Modern Warfare 2

Counter Strike Anthology

GTA IV + Episodes from Liberty City

Half-Life 2 (pre-Steam Store)

Audiosurf as the first game actually purchased through the store, though.

25 Dec 2009 Unreal Deal Pack 13,59€
:3

contagion when it was on sale

I bought audiosurf on disc and had to get steam as a result

CoD: MW2

The first and unique : Counter strike 1.6(it was an old bundle with condition zero and counter strike deleted scenes, I have no idea where they put the deleted scenes right now) then I sold that account. Actually all my games are from humble bundles or gifts from friends.

Well, it wasn't purchased on Steam, but it was the Orange Box.
Good times :)

ARMA II and ARMA II: Combined Operations.
About 23-25€ I believe.

Star Wars Starfighter :')

Battlefield Bad company 2

hehe, steam has nothing of my cash, I bought nothing from them, my games are retail games activated on it or gifts :P

Orange box in 2011 :)

Dark Souls >.>

Sleeping dogs :)

Terraria in early 2011. Fun times.

My first steam purchase from retail box is Half-Life 2 Collector's Edition. My first purchase through steam is Audiosurf.

retail: Half life holiday 2006 collection
On steam: Painkiller Hell and Damnation

I actually started using Steam after Ace of Spades became not free. It was perfect multiplayer shooter for me but now I hate it. So my first purchase was Ace of Spades.

Half-Life 2 around 8 years ago. It came with CS:S, HL2:DM, and DOD:S too. Well worth the £15.

Serious Sam 2 on Steam Winter Sale 2011. :)

Terraria

I got these in 2009.
team fortress 2 for £13.99
then the orange box for £5.66
...Yeah there was a 5 day gap between them. Not sure what i was thinking of back then