First deal, go easy.
I've seen a lot of deals for the standard edition at £19.99 but none for the Limited Edition. Bought this from the Manchester Arndale Game store so I assume it's in others.
Brand spanking new copy of Bulletstorm Limited Edition is £19.99 on either console when you buy anything else instore. Cheapest thing I found was Fifa 09 for the PS3 for 99p, you can pick up old Pro Evo games for a similar price, which makes a total price of £20.98, which isn't bad at all.
Bulletstorm Limited Edition Includes:
25,000 in-game experience points
Visual upgrades to the leash weapon
Peace Maker Carbine weapon