For $100'ish US you can get a killer cheater amp.... old school, but probably one of the top 10 amps ever made..... Orion HCCA 225 watt amp. Down side to them is the speaker terminals (make sure the speaker terminals are included as the original block terminals are no longer available) are basically pig tails, so you have to splice the connection, which isn't the cleanest or purdiest.
Stable down to .5 ohms.
I had mine only for a short while and it powered my Infinity Reference 1232W sub bridged to 200 RMS @ 2 ohm load no problem. I still have it, don't have a sub, but am not about to part with it. :P