No way $550 to ship!
I shipped a rescue last year from Continental and it was $99 flight fee. of course it may have gone up a bit since last year but I can't imagine THAT Much. The other fees are Vet health certificate(required for flying) which runs anywhere from $25-75 depending if you have a regular vet. Crate fee, Maybe $25. Possibly gasoline fees to and from airport for shipper( I would guess anywhere from $5-30. You also must show rabies shot current for that age which most likely is no more then $10 extra at the Vet check.
So the way I see it ....should be between $100-$250 tops depending what he already has.
So then it makes you wonder if he can bull%$#@ about shipping fees , what else is he lying about? I mean, Even if he said pay for shipping and a bit more to cover his costs of raising the dog, you might have been able to respect that and pay $550 but ........well you know!