I'd like to own A, but my Cash is no good. So I go out and buy a C, D, or F and then offer it to you in Trade for your A.
Sorry, this doesn't make any sense to me, and strongly suggests that the person wanting a Trade Only deal is hiding something.
Frog.
Its not that cash isn't any good. Everyone has a price, but a lot of "sellers" don't want to haggle over $. No ones holding a gun to their head if you send them an cash offer. The question is if C, D, or F is readily available (i.e. wanting a P2000 9mm LEM for a P220 Stainless) The used price of a P220 Stainless is the same (IMO) as the price of a used P2000 9mm LEM but the P2000 9mm LEM is hard pistol to come by unless you buy a new one off gunbroker for 800 bucks. Its not outrageous for someone to look for a fair equal deal vs. asking an unreasonable price to get a new pistol.
As my friend used to say, "Haggling over cash is vulgar."