not advocating buying snakes at this store (though I don't know really whether it's a good, bad, or mediocre place) but at the local Pet Supplies Plus, they're $88. I got my little Rose on Craigslist for $40. Just taking in Kingsnake ads at a glance, but it looks like they're $50 and then on up. Even with the shipping on Kingsnake, it sounds like you'd be paying less for a nice baby - and in general I feel safer with breeders than pet stores.
Just to give you some insight on prices.
Texas Rat Snake - Twix 0.0.1
Red Tail Boa - Rose 0.1
Shepherd mix - Simone
American Bulldog mix - Maggie
Crazy feline - Bones
In my opinion it depends on what type of store. for example, theres a reptile store called Chicago reptile house and they provide proper care however a place like pet land shouldn't own reptiles in the first place. Reptile breeders are generally a good place to get boas however if i were you i would go with online.
I'm in Canada, so online actually isn't cheaper here. This particular petstore just got in their reptiles a month or so ago, and I believe they bought someones collection of snakes who was getting out of reptiles or something. There are a lot of corn morphs and hets so it was some kind of breeder. Good breeders are still $200+ .
Might be getting a 2010 Dumeril for $50 this week instead though. Can't pass up that price