You should get tekket it is not $30 it is free it is just minecraft but with a bunch of mods/hacks stuff

 

ARMA II

 

with the zombie mod

 

MAFIA II!!!!

 

BTF3

 

AoE III is also good.
C&C: 3 is also good(any of them) (just not C&C:4)

 

Dead Island! The game has amazing graphics, and it's my favorite zombie game :]
The trailer is below, but I must say the story line is kinda sad...
http://www.youtube.com/watch?v=ialZcLaI17Y

 

BF1942
Or BFBC2
Or Star Wars Battlefront 2 ;)

 

Try Fallout New Vegas, I like it a lot.

 

Worms Reloaded, because I need people to play against.

 

I've been playing that the last few days. You can always play against me. (When I can use a mic easily again.) ;D

 

ROPER KUKE IS BACK IN ACTION!

 

:D
So is roper D0rc :p
You weren't the only one that loved the rope.
Anyway, this is off topic now.

I personally don't have any suggestions for games to buy for $30 because I don't know what you like exactly.

 

moved to off topic

 

This entirely depends upon your favorite genre of game though O_O
But if you want to try a good survival horror, Try:
Dead Space 1 (or Dead Space 2, I recommend the First)

Or if you want to have a heart attack once in a while:
Amnesia: the Dark Descent (Or the Prenumbra Series)

If you like a Good Rpg, Bethesda/Obsidian usually makes good games
I.e. Fallout 3 Fallout: NV, Oblivion, Skyrim(If it ever goes 50-75% off on Steam QQ).
Other good Rpgs: Deus Ex: HR(or the first one), Mass Effect (One, Two, Or Three), Fable Series, The Witcher 2, Dragon Age Series, Torchlight (One or Two), STALKER Series, Dead Island
There are plenty of other good Rpgs, but these are the ones I can Name Off the bat.

 

Black ops

(At target it`s 20 dollars for PC :O)

Get it just for N-Zoombies :3 <------(I fail at and die in round 3....)

 

Blank screen the game...
Its free and you don`t even need a console :D