I've bought items in the past through TalkBass and there was no problem at all from TalkBass itself and their member as long as you pay through PayPal. Don't ask an American his bank data with IBAN and BIC/SWIFT codes. 😱
The problem was simply importing from the USA.
Living in Belgium, I've always had to add 50% to the total amount including the shipping fee and insurance, because over here in Belgium, customs and couriers like to add loads of taxes...
These days, even if CITES has been "abandoned" for musical instruments, the Brazilian rosewood is still forbidden and the customs have a tendency to see Brazilian rosewood everywhere...
That said, as we still are in the Trump days, I don't buy anything from the USA anymore.
Even CD's bought in the land of "freedom" are taxed by the customs...