Best deal u ever bought on steam

The Witcher: $2.50
Portal 1 & 2: $8.74
Mass Effect 1 & Mass Effect 2 Digital Deluxe: $12.48

Gothic 2 - $0.99

Serious Sam HD: Gold Edition when it was 95% off!

The ones that really stand out in terms of enjoyment and the time I've put into them are Alpha Protocol for $2, Defense Grid for $2.50, Sanctum for... I forget (maybe $3? It was a 4 pack and I wasn't the buyer.), and the Breath of Death/Cthulhu pack for $1.

[edit]: Ooh, and Jade Empire for $3.75. That sale happened very shortly after I started using Steam. Glad I got it on sale while I could!

Portal when you could get it for free.

L4D2 when it ws 75% off, Terraria when it was 2.50 eur

GTA Complete Pack for 7€ if i remember right.

tf2

Eidos Collector Pack for $50

Half-Life 1 Anthology for $2.24

Max Payne Bundle for $3.74

Lots of games buyed with lots of useless coal on the past winter sale.

Not steam, but Mount and Blade Collection, on Nuuvem, 5USD.

Fallout collection on steam, 5USD.

Borderlands, 5USD.

Terraria, 5USD.

The Russian's Steam store is like Christmas every day.

Paradox Collection 92% off :)

paradox pack--90% off (?)--$100

played very few of the games because my computer is a potato...

Psychonauts $2.50

Half life complete pack 5.99
GTA San Andreas 3.75
Recettear 6.80
Droplitz 2.00

To me, it is Skyrim for 50% off - $30 (33%off from Steam + 25% Bethesda coupon). Yes, worth every single coin even for the full price.

Terraria for 2,50 was sweet, missed a lot of other cool deals though...

Beat Hazard, Audiosurf, Bit Trip Beat, The Polynomial and Rhythm Zone for $5

COH Complete Pack for 9.99

Section 8 Prejudice 4 pack + All DLCs for $13, thanks to that i ended with 1 sec 8 + all DLCs, nuclear dawn + Magicka, Portal 2 and Two worlds 2.

Really nice if you ask me :D

I haven't really bought anything on Steam that was having some amazing sale. The best would have to be buying TF2 for either $5 or $10. Considering this was like 3 years ago, and I have the most hours logged into it on Steam out of all my games, I think it was an amazing purchase.

Fable 1 for 2$ cant beat that

or Maybe Killing Floor complete for $4.1

portal cos it was free