I reconed some Boston Acoustics Micromedia PC speakers (late 90's vintage) last year. The old cones are easy to remove and with the correct glue and a paintbrush the new ones went on easy enough (was the subwoofer speakers that needed rework). If they ever need worked on again I will toss them. Foam surrounds don't last forever, you need the rubber type ones and they need a special glue.

There is a guy on ebay that sells surrounds for pretty much any speaker size and make (or was last year anyway).