Bec,

Check out http://www.focalmedia.net they have PowerSeek which is the script i use on the GWW Directory and several other of our sites.

Last time i checked the unlimited usage license was around the $500 price mark and it really is a great little script, ive been using it as long as i can remember and i actually think it was one of the very first scripts i purchased about 10yrs ago

Regards,

Lee