Welcome to the forums Steve,
Hopefully some Amazon owners will chime in with specifics but I'll take a stab in terms of general comments.
My first recommendation would be to find somewhere to interact with Amazons. Check out local bird clubs and rescues - the latter could be a good place to get a bird when you're ready as well.
When it comes time to take one home check out your source - if at all possible go to them and see where they breed/house the birds. As a vet tech you should be familiar enough with what to look for for appropriate housing and environment. It should be fairly clean, with plenty of room for the birds, a quality food, etc. I say fairly clean as I'm suspicious of such places that are spotless - if they're interacting with the birds in a healthy manner and devoting time to socialization the place is not going to sparkle. But it should be healthy as in not having anything growing in water dishes and so forth.
Beyond that talk to them. If all they're talking about is money and numbers then run away fast. You should be interviewing them about how they raise and care for their birds, but also they should be screening you to be sure you'd provide a good home for their bird. Any one who does not care where their birds go likely doesn't take good care of them while they have them.
Price can vary widely, especially depending on the species you choose. But keep in mind that the bird itself is only a small fraction of the cost. A decent cage for a parrot often costs more than the parrot itself. Then there are toys, perches, etc, and food and vet care (perhaps you can get a break on the last item).
Price will also depend on whether you are re-homing a rescue or buying from a breeder. But in either case I suspect for most species of Amazon you would be looking in the range of at least a couple thousand dollars. [Edit: couple thousand would be the low end for bird, cage, and supplies not the bird alone. Although at the higher end the bird alone may cost more than this.]
If you are re-homing it is not unheard of to find someone looking for a home for their parrot with cage and all. Here the price will generally be substantially less. These opportunities are, however, few and far between, and in such cases you need to look into why they are giving up their parrot. There are certainly happy healthy parrots that must occasionally be given up, but often people advertise a "happy healthy loving" bird as a means to get rid of an animal that they have thoroughly neglected and messed up.
If this is your first parrot I would avoid such situations and look to established rescue organizations or breeders. It can be pricey but your taking on a lifelong companion.