His current avatar is a desert ghost bp I think.

If you ask me, prices are a minor factor in the purchase of a snake. If you want a healthy, beautiful snake, best thing to do is go for a good breeder. If the breeders prices seem a bit high, but they're trustworthy and it's not a rip off, I'd think "hmm...I could pay 50-100 dollars more for a good captive bred specimen...or I can save some money and go get a mite infested, unhealthy one from Petco/pet shops". I'd go with the more expensive snake in a heartbeat. Money isn't a big factor if it means a healthy and happy snake IMO.
My bp cost me 100 dollars from a breeder near Toronto. Her bp's seem high priced, but currently it's the only good breeder I know that's close enough to me to get a snake from, so I went with her. I don't regret the extra cash at all. Her prices were ranging 90-125 for normal bp's. Most/all had the "bullseye" patterns, and 50% of them had high white markings. Some were high gold, etc. They were all beautiful. And well worth the extra money. I don't think you'd find any snakes that good looking and healthy in a pet store. Breeders are the way to go. I'm waiting till June, the breeder from Toronto, has her gravid boa's give birth. Then I'm gonna work something out with her and finally get my boa. I'm sure I'll pay 150-200 dollars, but IMO it's worth every dollar.