I have no idea if these are good though. Probably depends on how long since manufacture.
I have about 30 OEM Apple IW II colour ribbons, which I picked up for cheap a couple of years back on Craigslist. After testing out several of them, I can honestly say it is
not worth picking up any old/new stock colour ribbons (unless, of course, you want them for posterity, which is why I didn't throw out the rest of them).
The reason is the pressure pad inside the ribbon cartridge deteriorates over time, which causes the ribbon to get stuck, and eaten by the print heads (it's almost similar to some of those foam pressure pads that you can find in early Betamax tapes). They may be good for a couple of pages, but afterwards they become utterly useless (I can post some pics of my test pages, and of the pad if anyone is interested).
The big-box business stores no longer carry them (been there, done that), but the black ribbons are still available (and, AFAIK, are still being produced) as some of us have already indicated in this thread.