http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=18797&item=5779156209&rd=1&ssPageName=WDVW

used but they are good amps

Over your budget, but a great amp;
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=18796&item=5777587682&rd=1&ssPageName=WD1V

Under $100 is going to be rough if your looking for a good amp (ie real 600W)

Previous Owner of 00 SVT Contour #1077/2150 95 Contour SE '01 3L