Funny you should mention the Odyssey2; I ran across one at the local Habitat for Humanity store a couple of months ago.
It had arrived in the box. That had been broken down and tossed into a trash can, evidently fairly close to when I had arrived at the store.
Five boxed cartridges (nothing that could be classed as either rare or unusual) were included with it. Their boxes were in great shape right up to the point where they were double-wrapped with packing tape to hold them together, then taped down to the keyboard so that they wouldn't get lost in the store.
The asking price? $150. I made some enquiries as to how they had arrived at that number, and was given the usual 'according to our research...' line, which, upon further investigation, meant 'we looked at eBay'.
They weren't very happy when I pointed out that they had effectively dropped the system's worth to around parts value by how they had handled it. It sat on the shelves at $150 for a couple of weeks, and (I believe) was eventually sent to e-waste.
Thrift stores and the like are more or less a waste of time these days.
I paid $5.00 for the 02 lot, though nothing was boxed and I was quite shocked at the price.