Happened to actually find one of these (The M4 Sherman) at a hobby store in town - a bit overpriced, but my impulses and watching the shopkeeper drive it around on the counter sealed the deal.
I'm having one problem though. My tank only seems to work on ID4. I must be mis-reading the ID setting procedure, or misunderstanding something about it. If I try to change the ID my tank doesn't respond... only ID 4 works.
Everytime I post a message here I figure it out about 2 minutes later
Sorry about that. My photocopied english manual wasn't as clear as the one I saw a posting for online - I found that you really have to focus the remote right down on the tank in order for the ID to actually change.