To a dealer, outside financing (like from a credit union) is cash.USA new car market - "29% of all new vehicle purchases are all cash". 2.4 million new cars in inventory (up massively). Interest rates on dealers' stock very high (floorplan).
I think you may be misgrouping, and that the guns are all part of one demonstration. Elon says 'I don't want to give it all away, there are three demonstrations, one that people are aware of ...'On the Joe Rogan Experience podcast, Elon said:
"There are 3 demonstrations, one of which is emptying a tommygun into the side of the car. A shotgun, a .45 and a 9 mil"
A "tommygun shoots .45 ACP cartridges., the shotgun is self-explanatory, and by "9 mil" he means 9mm pistol cartridge.
So that's the three demos he was referring to, and don't get too excited: these will be videos, not live demos.
The Tommy gun shoots .45 ACP, but is not what is normally called a 45 like a Colt or M1911A1 pistol.