Hi, Most Tanks are sold as toys and are aimed (sic) at people between 5 and 15 they are in the main not that knowledgable about types and are influenced by the media and their peer group, there have been two major Hollywood blockbusters featuring Tanks the last one being "FURY" and both concentrated upon the M4 (Sherman) the other Tank these young people have heard of is the Tiger 1 simply because it has assumed the role of Legend, and that is where the Market is (PROFIT) We as hobbyist's assume a very small niche in model Tank sales. it really is about demand allied to price, Most people have never heard of the American or German Tanks you listed and very few people could tell you the name of any particular British Tank and that's why they are not on sale YET. shaun