The Acoustech H100 supposedly has (partly?) designed by Dr. HSU. At the very least, it uses the same 150w/500w BASH amp as the HSU STF-1.
It normally goes for about $250, although I have seen people talk about getting it from retailers (on ebay) by giving bids/quotes at $200 give or take.
I used to own one. It was very good for a small- to medium-sized room, and good to about 26-27Hz or so. Just don't expect it to "shake" larger rooms, say larger than 13x17. For larger rooms, you need more power and more woofer to get the same amount of bass.