@dwette thanks for the lead. However, 400 bucks for a dust cover? Probably more for custom jobs? If you're handy and have the appropriate tools, you can buy plexiglass panels from a building supplies store, cut 'em down with a glass cutter and do the appropriate joinery yourself, thereby avoiding the labor charge. The computer & office equipment dust covers are way cheaper, overall, as long as you don't mind the aesthetics issue. Still, thanks for the lead!
P.S. Arts & Crafts stores like Michael's sometime have plexiglass cases in various sizes that you could use as a dust cover for a whole lot cheaper.