Tank junk yard

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I like the junk yard as it is, but there is major room for improvements. I'd like to see a junk yard for sold tanks as well as an notice if you want to buy a weapon which already was sold to the junk. I very often see people buying weapons which are also available on the junk yard. Sams goes for sold tanks. If you buy a new one, it automatically takes the one from the junk for less money. Would really help new players who often upgrade their tanks really late.