its still the cheapest on http://www.getgamesgo.com/product/total-war-rome-2-po 22% from the beginning @ $46.76, preloadable on steam

comparison:

http://www.cheapshark.com/browse?title=rome%202

http://www.cheapshark.com/browse?title=rome%20II

sorry i didn't post this earlier

Greenman gaming has it at $47.99. It comes with steam codes that you get right away for preloading.

@sackmanjones: same with the link i provided, the codes are linked to your account

apparently its possible to get it for $35 on a Portuguese site called Nuuvem similar type of site like GMG http://forums.steampowered.com/forums/showthread.php?t=3170265 working for US users since even previous TW games didn't have regional locks on steam. i personally got my copy from Get Games so i cannot verify this option

Nuveem seems to have implemented geo locks on most of their pre-orders now, FYI. It is a sad day, and I had only just discovered that site.

I got it for 34 bucks, found a dude on total war center forums that was from Russia and trustworthy, games not region locked on steam so it can be gifted to overseas accounts.

It's £29.99 on steam now if you didn't know. 33% off apparently.

It's £29 on GMG, that's the cheapest you'll find from a reputable place I am sure.

Edit: Sadly that's only a single pound cheaper than a normal PC game, but whatever.

45 AUD at ozgameshop.

You get The Greek States Culture Pack for free if you pre-order off steam. Not sure if that applies for all early purchases.