Just for reference I looked through my records to get you the exact cost of treating a WC animal for parasites. (My vet's prices are fairly reasonable, other vets charge $50-60+ for an exotic exam fee)
Exotic fecal - $22
Exotic exam - $44
Panacur suspension - $8.60
Exotic fecal - $22
Panacur suspension - $8.60
Exotic fecal - $22
Total cost for one $40 WC gecko: $167.20
I'm not suggesting that a CB gecko will never have parasites, because they probably will at some point of their lives, but because they're generally healthy when you get them from a good breeder a parasite load isn't going to be an immediate threat to their health. A WC, on the other hand, may just have spent weeks in cramped conditions, with high stress, little food and water, poor proper heating/humidity, and this means that parasites have ample opportunity to over-power the immune system and potentially cause death. And parasites aside, just the experience of importation can cause death for all the reasons I mentioned.
So it's worth spending the extra cash and buying a healthy, hardy CB gecko when you can for lots of reasons
