I wouldn't be surprised if Westrifle could sell RC's for $600-650. That is what Milarm charged and they sold out.
I think some rare RC variations are even worth more (snipers, SS contract guns, etc).
I know that late in the War the US troops were given an order that they could bring rifles etc. back as long as they had Capture Papers (featured in the book Kriegsmodell - sadly sold out I think). As per duffle cuts, I think they snuck some home too, but I have seen duffle cuts with bring back papers as well.
I haven't heard of Canadian troops getting such an order, so I think we smuggled many handguns back. One reason why Lugers/P38's etc are so much more common in Canada and sell for 1/3 US prices.
I heard that some of the Eastern block countries still have K98's and G43's but the asking price is too high at the moment.