That's not too silly a price given that older versions of Super Snapshot sometimes attract $50+ prices on Ebay. The real problem lies with JP Products often taking 6+ months to fill people's orders, if at all. Few people on comp.sys.cbm are willing to part with their carts either. Centsible knows this so they're trying to capitalise on the situation.
Having said that, Centsible seem to have gone loony with their prices on Amiga gear since they've gone around buying it up in North America. You reckon they would be keen to move some of the gear and price items a lot more realistically.