DONT buy your normal brand inBg...buy Victory, which come in various strenghts....Victory White about the same as Lamberts...last summer 27.50lev per carton. You can check the price, printed on each packet!
Ditto what welshlady says. I buy Victory in Bansko and have never had a problem with them. They do white, silver, blue but are about the best you can get (genuine) and at a good price too.