Hmmmm. Maybe you can look up APDT (American Pet Dog Trainers). They should have a list of trainers with their proximity. I suggest them because they at least have to jump through a few hoops to be certified with the organization.
I think I wouldn't go to a store to get vet-care for my dog. I have heard some nasty things from these vets. If I asked a vet to check something out on my dog, and they flatly refused, then I would probably seek another vet.
However, puppy biting is pretty common, and your complaint is something that does sound more like a behavior problem then a physical problem, and if that is the case, then kudos to the vet for not taking the opportunity to run useless tests on your dog.
If you are not following NILIF (Nothing In Life Is Free) with this pup, you might want to look that up as well. It is about leadership. Your puppy thinks that he can keep possession of something that you want, and if you adjust your leadership style so that he understands that you have a right to whatever is in his mouth, then this won't be a problem. I think that if you follow this, especially those points that are hardest for you to do, I think it will get better. This doesn't have to be forever, and it can be.
Kudos to you for not waiting for the pup to be big and strong and scary enough that this is an emergency before addressing it. I hope some of the people who have landsharks will chime in.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC