They'll be diff prices according to the value of the animal to the seller.
Best way to check prices, is to check all the sellers of that morph(kingsnake, breeder webpages, etc etc) and see what everyone's prices are. Keep in mind the integrity of the seller might up the price for you, instead of buying the cheap one from Joe Scammer online.
I wish you the best of luck and we want pics if you get it! Spider ghost... ooo.. that would be nice to make.. gotta go look that up...