You can get WC2 Deluxe Edition for an extremely cheap price if you search for it long enough. There was a guy on here who purchased his for only around 89 cents. Not bad for a CD-ROM version of the original game, both expansion packs, and the speech pack. Plus, it means you'll have a backup for the game you already own.
Whatever you do, don't buy it from StarVector.com, though. It's already been established within these forums that they charge waaay too much.