Germany has very strict export laws, so in a nut--shell? No, not for civilian sale. One would presumably have to look elsewhere and find a stash of semi-auto-only G36E rifles in a nation that will aĺlow them to be exported. The rifles could not be retrofitted from select-fire systems as that would make them prohibited 12(3) Converted Automatics. They would also have to be fitted with either factory G36E or MG36 barrels in order to have sufficient length for Non-Restricted status.
Good luck with all of that, which is why they are so few and far between, limited to the handful that entered the country many years ago. Hence the high collector value, based on rarity. Simple supply and demand...
This is why I sold my M10X, among other firearms to generate the necessary cash. Are they worth the asking price? Of course not! Unless you happen to be a Canadian collector and this happens to be your "unicorn" gun. Then maybe...