I just read through
this old thread, concerning paying with cash at a Hamfest.
Everyone keeps telling me to get a modern radio, not the boat anchors that actually interest me. Are these seriously the same people who discussed payment for a page and a half and never once mentioned PayPal? They have apps for both Android and iOS (meaning you can carry your PayPal wallet with you), and can be funded from PayPal balance, a checking account or a credit card -- and even if you don't maintain a PayPal account, you can download the app on the spot and make a credit card funded payment
to a seller who isn't set up to take credit cards.
This is not news, folks. I've been using PayPal on a routine basis for more than a decade. It's as secure as you can make your password (correcthorsebatterystaple -- google it), the funds can be verified by the seller literally as fast as you can tell them "You've got money," and the fee to the seller is very minor (a couple percent) and can be automatically included in the amount PayPal charges your card or account. And in the unlikely case you get home and find out that Hallicrafters S-38 has all the correct dials and connectors, but is actually full of rocks and sticks instead of tubes and capacitors and coils and resistors, you can file a dispute against the seller at the PayPal site.
If you sell used radio gear, you owe it to yourself to set up and verify a PayPal account before your next Hamfest. Accept a bunch of cash and you make yourself a target. Accept the same amount by PayPal, and you can walk lightly on your way home (and not just because you sold me one of your boat anchors).