I do this every few months, I fly down to the states and pick up my "enhancement" prescriptions. My HRT doc down there will prescribe up to 400mg per week of test, with deca and primo on top of it. And hgh to if I request it and I'm only early 30s. They are willing to push the envelope of anabolics a lot more then Canada is willing. They always give a written physicians note and prescription documentation for the boarder, never had any issues.
My trt doc here in Canada only prescribes up to 175mg per week. So it's worth while for myself to pop down couple times a year for extra goodies and enchance my therapy while still under doctored supervision. My doc here thinks it's wrong, but not a lot he can do about it lol
To answer your shipping question, no. No company will be able to ship across the border as far as I understand because of legality issues. You have to have a address down there to recieve the parcel at and be willing to travel for it. But crossing with it in your possession is totally legal with a script.