Example4: You see the Black Friday ad for $400 Glocks at a local gun store. You tell your wife "Hey! When you go to get milk, swing by Bob's Tactical Armory and Mall Ninja Supply and get me one of thse Glocks.....here's some cash...." Again straw sale because your wife is not the actual buyer/transferee....you are.
I think this is a gray area if there is one. Who is to say that the gun isn't for both of them? If so, then she is the buyer.
Is the money "his" only? Or is it "theirs?"
Do you factor state property laws into this equation at all?