My good friend worked for petco for a year, but moved over to working for VetCo last year . They only ever have farmed BPs, and they never treat them when they come in. If they get sick they will sometimes treat them if they look bad enough. Good call on taking yours to the vet!
If you are interested in doing a little diagnosing and treating parasites yourself, there is a great book called Understanding Reptile Parasites: A Basic Manual for Herpetoculturists and Veterinarians by Roger Klingenberg that explains things very well. It is cheap, and great resource. I hope Kahn's treatment goes well.