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This is incredible. There's a CMD SuperCPU for sale on eBay right now. Bidding started at 99 cents, and it's now up over $2,000. https://www.ebay.com/itm/CMD-SuperCPU-Accelerator-Super-CPU-Creative-Micro-Designs-Commodore-64-128-C64/142951092910
The SuperCPU is a Commodore 64 accelerator in an oversize cartridge. To put the bids in perspective, from 1997 to 1999, CMD was selling them for $199 without RAM expansion (which this one seems to be) up to $379 with the maximum of 16 MB.
That SuperCPU I stumbled across sold for $2,524, more than 12 times its original retail price. That's absurd.