Well, I won't bid this time, so I'll leave it to you guys.
I did send the seller an eBay message asking what other goodies he has waiting in the wings. Xonar, when you pick things up, maybe you can negotiate directly to buy some more items?
At the moment I see M0110s, M0110As, M0116s and AEK IIs. These are all wonderful keyboards in their own right. The ones with Salmon Alps switches, in particular, are real gems. Those are usually 1990 AEK IIs without the [ S ] in the lower right corner of the label.
I've had good luck in the past with contacting eBay sellers directly but every seller is different.