you can get one like mine, full name is "creative sound blaster X-fi Xtreme audio" its like the entry level "X-fi" card, and it cost me about £50 at the time from pc-world(dont ask, i was in a hurry and couldnt wait for an online order) but now you can get one for as little as £31 from Ebuyer http://www.ebuyer.com/UK/product/121761

Thats just OEM though which means you dont get a fancy box like they come in from shops, you'll just get the card/ cd with software and drivers, which is all you need anyway

Its a great card and would push any speaker system to its limit