There are many DIY sump projects out there on the web. You could easily make one out of an existing fish tank some extra cut glass or something similar some pvc, hoses and a pump. Check around, there are a lot of DIY projects at about.com.
--Andy
Decide what dimensions will fit under your stand, and get an acrylic fabricator to make one for you. Look in the yellow pages and you should be able to find someone to build it for you.
Sonny