Looking at the ebay seller who sells these Trumpeter tanks,
Hobby Summit, I notice they sell another brand as well, name of Tokyo Marui. What's interesting is that the larger scale Trumpeter's (1:16) are cheaper that the smaller scale Tokyo Marui's (1:24).
I wonder what the reason is for that.
I do notice that nowhere does it say what kind of combat system is used by the Tokyo Marui models (either infrared or BB's). If they shoot BB's, that might make them cheaper.