I think you’ll find it is against US real estate law to accept payment by credit car, at least the full payment If not even deposit. I believe it is something to do with not us high credit cost means to pay for it.
I understand your reservations but if doing a purchase via resale you are going to have to use an established agent and take the chance.
One major piece of advice do not send the money using information just sent by email, or for me even just website posted. Do what you can to find a telephone number, even better if you can check this number from different sources. Then call them to check the account details. The reason is there are fraudsters who intercept emails and change the account numbers. I’ve a colleague whose customer did not do this and he lost £500k. It is not your banks fault as you give the instruction, it is pretty nailed on they would not refund you,
There are quite a few that have been around a good few years. DVCstore.com is one. If you watch Disunplugged DVC show they appear on that.