I am not sure I've seen more than maybe 1 or 2 petrol baby spys show up on eBay. The regular ones in petrol used to show up pretty regularly, but I'd say now maybe it's something like once a month. Usually they seem to be pretty beat up, too. If you really love the petrol and you find it at retail, I'd probably go ahead and snap it up rather than waiting for one that is most likely not in great condition on eBay.