Hey, this is neat.

If you have a Mac LC (kind of a crappy model but that's beside the point), you can turn it into an Apple // compatible with an Apple IIe Card.

Turns out there's a TON of these around, and at reasonable prices too ($30 or so). Look up this Apple part number:

820-0444-A

There is a downside, though; to run Apple // stuff from disk you'll have to get ahold of a 5.25" drive. Not sure how easy it is to connect one to an LC.