For appraisals, my go-to is eBay completed items.
You’ll see what stuff actually sold for.
There have been no recent sales on the -D model, but a -C sold for $270. Seller was asking $300.
Put it on eBay at $325. Wait a month, reduce it then to $299.
The flea market will bring $100-200, if you have a buyer with strong interest. Not my first choice.
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Stuart Cody