The last game you bought on a disc

SW:TOR and yes.

GTA IV for PC. It has always retailed here for INR 499 (between 7.5 and 10 USD thanks to the recently fluctuating conversion rates) and I picked it up while it was on a further 10% discount.
I bought the entire GTA pack after a couple of years on GreenManGaming for Steam.
Regrets? None, even though I bought it again for Steam.

ShadowMan (1999) from a pc magazine

Diablo 3...sucks...

Around the same time: 5 copies of Call of Duty: Black Ops 2 to resell. 3 copies of SimCity to resell.

borderlands 2 £14.99 out game

Well I purchased a gamer-magazine which included Alan Wake in it's full beauty in a very nice box, so that would be it I guess.

I think it was Tomb Raider....or To The Moon. Can't remember when I got the latter, I already had it on Steam but I really wanted a boxed copy, since I liked it so much.

Skyrim at release 11.11.11. for 43€ And I regret it because i played it a bit (around 30 hours which is nothing for skyrim) and then played other stuff I was somehow EVEN MORE hyped for then skyrim. And now I saw Skyrim LE in the Steam Sale =/

In these days I have bought Forza Motorsport 2 (already played yhe other chapters) and Blazblue Continuum Shift Extend for 360, on PC the last one was the Divinity Anthology bought on the developer's site.
No regrets.

EDIT: I have the preorder of GTA V pending

rocksmith

Mirror's Edge! Awesome, awesome game. :)

Uh... I have no idea. Probably LIMBO for the 360, which was a long time ago... way back before I joined Steam.

SC2 Heart of Swarm after the release

Metal Gear Solid 3 Subsistence. :)

Suikoden V, and I was really happy to get my greedy hands on it.

prince of persia the two thrones

I bought a copy of Descent II on CD, just for the soundtrack. Lots of hard electronic music on there. I recommend it.

The last game I bought on disc that I bought to play was Arcanum, which you can pick up from GOG today. In 2001, I bought a copy from ebay for a friend who liked watching me play my copy. I could have just burned him a copy, but I want more games like this to come out.

Prey.

Only to activate it on Steam! :D

For PC only? It was either Aion or Crysis (which ever came second). If consoles are included, it would be Gran Turismo 5.

S.T.A.L.K.E.R. Cień Czarnobyla

Diablo 3 in stead of public opinion i did quite like it.

Diablo 3 and S2: HotS.

left 4 dead, online store with courier delivery. And yes, i do regret buying it, could get l4d twice cheaper as simple cd-key.

well i just bought today, something called I.G.I-2 Covert Strike, for 2.90 euros. It looks like some fun old skool FPS..hope im right :D