That is quite the paradox. You're best bet to find a decent amp for the money may be to look for something used. Try to find an amp rated for one channel, 600 amps at 2 ohms. Connect the subs in parallel and then let her rip. Be careful buying an amp with high THD. this will blow a sub quicker than too much power. Also buying an underpowered amp and cranking the input sensitivity gain will also harm the subs.
You want something that comes as close to producing RMS power equal to the max RMS rating of your subs without going over that rating. Other than that, total harmonic distortion (THD) is the most important rating of amplifiers. THD is expressed as a percent, and you want the lowest number possible.
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