I sold an AEK2 on bay for about $15 but I had worked on cleaning it so that it looked pretty good, and it took a couple of weeks. Had the cable, too.
A few months ago somebody sold a dozen ADB-to-USB adapters on ebay for $10 each instead of the usual $40-50. With that, you can actually use the AEK or AEK2 on a modern computer, so the deal becomes much sweeter. Without the adapter, they are hard to sell.
I like the AEK with pink ("salmon", according to my daughter, and she would know) Alps better than the AEK2 with whites.