When was the last time you bought a game for it's Full retail price on Steam?

Never, on Steam.

Outside Steam, It's Minecraft. I don't remember when but it has been a while.

Left 4 Dead, Orange Box. Asian senses kicked in when i saw my first sale.

pre order of civ5 brave new world.

yeah, it was a 10% discount but for me it felt like a full retail price.
(especially when a week after it released, it got 33% discount on steam summer sales) T_T

and a little OOT confession : it is my 1st steam game and my 1st original game.
ftl is my 2nd one, bought at 50% discount and felt very happy.
(at the time I didn't understand yet about daily/hourly deals nor bundled games).

I just bought Starbound yesterday

I'm pretty sure the only game I've ever bought full price was EDGE. I know, seems like a silly one to pay full price for but I'd just joined steam and had money to burn and it looked like a neat game, and it is. I got my ten bucks worth, no regrets, although nowadays money is much tighter so I almost always wait for some form of sale til I buy games. I bought Game Dev Tycoon when it was like eight bucks and to me that was a splurge, haha.

The Wolf Among Us, even though it's 10% but it was my birthday and I gave in to my self-indulgence.

Amnesia: AMFP. Actually that's not even true, because it was on preorder discount.

Hmmm... probably never, tbh. I pay full price for some of my 360 games, but pretty much never for PC games.

Bought 2 for the entire time. Civ 5 Gold for $49.99 and XCOM The Bureau for $44.99(10% off for pre-order but full price for me :P)

As far as I remember, I preordered CS:GO and Brütal Legend back in the day.

Borderlands 2 pre-order, too much hype; and i played like 300+ hours, so i think it was worth it.

duke nukem forever >_< i actually regret not being able to play it before it went on 75% sale
oh and rocksmith 2014, mortal kombat 9 , actually i buy many games full price and dont regret it, i actually stopped buying most bundles because i dont even want to have these games :D

CS:GO back in the day.

Kerbal Space Program on 16. April.

I don't understand the question. Steam sale stuff at full price?

Poker Night 2 pre-order when released.

got a 3ds that came bundled with Zelda. But if we're talking about a purely game purchase, i pre-ordered borderlands 2.

Not that long ago. Football Manager 2014.

On Steam? Never :D

Metro Last Light + Season Pass

first and last time i bought something full price was at the release of The Wrath of the Lamb DLC for Binding of Isaac

Spelunky, August 2013.

edit: ah, no, Pool Nation at October.

Torchlight 2 pre-order. Not a bad choice, but I don't think I'll be doing it again any time soon.

Resident Evil 6, pre-ordered two days before its release.

Bought Starbound for full price last week.

Portal 2 pre-purchase. Won't be doing that again in like....EVER.
Also a few Early Release games but they usually have a -10 -20% off.