Other than my very first one, which I overpaid for, I've found good reliable dealers that have all been $50 in FL and TX. You can look at gunbroker.com, click on buyer, then click on FFL search, and look for shops that say they handle class 3. For $50 bucks though, I don't expect any hand holding. I fill out all my own forms, I don't call the FFL to go visit my new toy, or try to schedule a shoot with the ffl or anything like that. I did find one houston one that popped up with transfer fees of $100.
I pay $100 to Class 3 Weapons in Houston. Yes, that is more than most, however considering the fact that wait times are currently 4-6 months, I would rather have someone insured to keep my item in their safe while I wait, not to mention that it is a storefront and more than 1 person can do the transfer. If you go with someone that does it out of their "home office" what happens if they are broken into and the item stolen? Do you think it will be completly insured? What if, heaven forbid, the person is hurt/killed in a car wreck, who will handle the transfer then? I consider that $50 extra just a little more insurance money.