The Search Pets link can help you price pets. ;o Just select the species and color, set the order to price and the minimum price to 1 tu, and you should be able to find the best price for your pet. Takes a bit of judgment on how popular the name would be though; most people look for quality of names more than other things, when buying. I'd rather spend a few thousand more tu for a Creatu named 'Vore', rather than go with the cheapest one and end up with something like 'fluffee234'.

Anyway. I'd say about thirty to fifty thousand on yours.