I'm not going to be much help here, but I'll try. My grandfather takes quite a lot of medication for various illnesses. They became so expensive that my mother had to look to Canada for meds. There are a lot of shady websites, but she found that legit pharmacies have to be registered with whatever pharmaceutical regulation agency they have up there. Only a handful of the websites had this certification.
She ended up getting the real deal for about a third of the price. I'd like to be more help, but doing some searches for whatever agency certification they have up there might help.