If you really wanna piss in the wind get on
eBay and search 'Coustic Power Amplifier 380" and you'll see two 1987 model black coustic amps. The one below had a BIN of $49 and someone bumped it between yesterday and today with a bid and killed the BIN. Maybe the seller will accept your offer of $50 on an email. That's what he wanted for it.
You should be able to score either one of the TWO on
ebay for $50 or less. That's 300 WRMS of old school 1980's raw unmolested power. By todays severely over-rated power standards on most cheaper amps it's like 1,000 watts of anything at Best Buy (for comparison) but sounds MUCH cleaner and more raw. Stick an electronic crossover on it such as the XM3 on
ebay for like $20. Under $100 you have a decent little sub amp and have the rest of your money to blow on subs and mids.
It is the equivalent of the old Power Logic 460, which people used to use to push 12's all day long. If I had a budget that's where I'd stick my cash. I could build a system off
ebay with (2) brand new MB Quart 12's ($50 each) , the coustic 380, and an XM3 (old school, preferably this one) or XM4 (newer one, meh it works fine) crossover and have a full amp, sub setup for $200 that'll plow the hell out of any $400-$500 setup you'll get from Best Buy.
$50
$25
$59
You really want the most from your money, there's the best $200 you could spend. If you are looking to buy diamond or some other non best buy brand you can do better if you spend a lot more cash.
If I were ballin on a budget, that would be my $200 system that would drowned out the guy beside you pulling out of BB with $500 less in his pocket than he pulled in with.