Centsible is utter shite. Not only they are extremely rude, their prices are a complete rip-off.
I once paid 30 dollars for a disk-only Giana Sisters original on ebay... This really is a rare game... when I got the disk it turned out to be a pirate version! The seller, however, was a good person who didn't know this (disks were untested) and refunded my money.
A real shame, I wanted a Giana original! But if I bought it from someone like Centsible I would have been ripped off.