just my 2centsI agree with paying too much for it. You can get a healthy BP that eats for really great price from breeders. Heck some of the great folks on here breed BPs. Most breeders don't even sell their BPs until the BP has actually fed three times. That will give you time to have everything set and ready and all you will have to do is put the snake in the enclosure.
An example of being setup first before the BP gets there. I just got a brand new rack at my local Repticon. I out hides, water bowls, substrate, and a hygrometer in the tubs and let it sit. I checked the temps and humidity (frequently) every day for four days. I had to use a soldering gun to put the right amount of holes in the tubs to get the humidity right. All the while, my BPs are still in there original tubs doing things as normal. Then once it got right and everyone fed in there old tubs, I waited 24 hours and then put my BPs in the new rack. I continued to moniter the temps and humidity with the BPs in there (humidity is a little higher due to the BPs breathing in the tubs) but one or two more holes and it's great so far but I still am monitoring before I get totally comfortable. So my point is to set the enclosure upand have everything good to go and in the mean time check with some of the breeders on here to find the new baby you want and then everything will be good to go. I think this will increase your chances of not having a repeat bad encounter.