Depending on condition, I have gotten $52 to $100 out of Cane Creek thudbusters. Just sold one for $52 that was well used but serviceable, $100 was spotless, near to NOS. Be sure to use the term thudbuster in your listing.

I see the SR clones doing pretty similar.

Love to find them on MTBs or as individual used parts. Picked up a Cannondale MTB one time, sold the post alone for $90. The average recreational rider doesn't put a value to them anyway, so a swap out with a traditional post nets the same $$ on the bike, and then someone looking for that particular style post will be interested on that big auction site.

Unless your bike looks better in person, it looks more like a part out to me, possibly donating the frame to a co-op.