Ok---- we need more information!!!!!!!!!!!!!! What impedance are the subs? Dual voice coil? Single voice coil? This is important stuff! How many ohms?
You may not want somethin expensive, but remember you get what you pay for. Dont settle for a cheap overrated junk flea market amp.
Your subs handle around 1500 REAL watts all together, so you are gonna have to pay some for a decent amp.