sony 4 channel amp for mids and highs @ WAL*MART. i believe its like 92 bucks or something like that. works great and when something goes wrong, just return it.
I've been very happy with my TMAs; there's still a few models left at millionbuy.com. They're a JL Audio subsidiary. I have a 500 Watt monoblock and a 75 x 4. Paid $320 for both I think, as they are discontinued.