I hope you already jumped on that deal because it's one of those "you won't see that deal again" things. Like Gene, I went with Stockroom route, with their table and base and I haven't looked back since.
My buddy has a Jet surface sander he got for free (how's that for a killer deal) and it's great, but when it goes wrong it goes really wrong.
Both have their advantages. One for the SandFleas and SandMasters is, you can even sand latex paint covered boards and not load up your paper.
When I built mine, I didn't have a 1750 RPM motor, so I swapped pulleys to drop the speed. I had to relieve that end of the table to allow the pulley to sit proud of the table, but you never use that area anyway, so can cover it with a small box, if desired.
Does anyone have experience with Sand-Flee surface sander? There is a used one for sale for $150. I am tempted to buy it, but I like to hear about your experience. I understand it uses velcro back sandpaper. Are they easy to find? Where can I purchase them?