Really? I agree it's a bit more pricey but since the weight is all meat, and no fat, I think it's worth it. I don't have any trouble getting extra lean mince (we have the choice of Asda, Sainsbury's, Tesco and Morrisons).
Extra lean pork is a little more tricky to find, but I can get it in Sainsbury's (BGTY green label) and Tesco (Healthy Living range) without any problem at all...
At least you can freeze these things so maybe a trip to a big supermarket is in order?