Far be it from me to encourage any illegal activities but I err... know this bloke who buys his pipe tobacco online from "Four Noggins" in Vermont and mysmokingshop.co.uk. Occasionally, customs will open a box. This err... bloke never buys more than three tins in one order, so the worst that has ever happened is a slip inside the package informing him that customs has inspected the package. He has never been pinged for any duty or had a package confiscated. To give you an idea, three tins of top quality baccy from the USA, including shipping is less than one tin of drugstore blend garbage, over the counter here.
Customs are busy, they can`t open EVERY parcel that gets sent through and they are concerned, quite rightly, with drugs, guns and dead parrots, rather than a few tins of pipe baccy, a bottle of grog or some hot peanut butter. Here, if you order something illicit and they open your package, they will return it to the sender (at their cost) so you can get a refund. Obviously, that doesn`t apply to guns or drugs.
So, this bloke who I know would probably say "Get one of our overseas members to order it for you, worst case scenario is you`re going to lose the cost of a jar of peanut butter."