Just a quick tip that I discovered yesterday: many supplements and health foods listed on Ebay US et al. are not available for display to EU IPs (at least for my country), so you can't apparently buy them.
However, if you use the TOR browser which basically "hides" your IP, you can view those supplements, log on to your ebay account, and if you add the item to your watch list (you can't buy directly in TOR it seems), you can then switch to another browser with your regular home country IP, and then acquire the watched item (through paypal usually)...