They certainly would sell quickly and for a higher than average price in any shop that I walked into. Good luck selling them, I'm betting they fetch a decent amount of money.
BRAND NEW NEVER OPENED NEVER USED!
"EHEIM Quick Vac Pro Automatic Gravel Cle ...
Everything is brand new, tank only lightly used
for aquascape. I purchased a larger tank for my
Offering a beautiful blue and yellow damsel.
Approx. the size of a gold dollar coin. He's
being a b ...