IF they are a legitimate business do they take credit card as payments?
Verify address and business name is legit via Texas secretary of state. Ask the seller to send you a W9 form to make sure it matches tax ID and address to what the secretary of state website says it should be. If they won't do that they ain't a business worth doing business with.
If it all checks out send cashiers check via US postal service certified mail only to the address listed on their entity verified via the secretary of state website as their business address. That way as least you have postal police protection to go after via mail fraud.
DO NOT WIRE MONEY!!!!!
You know, they might take credit cards. I will check that out.
Escrow.com says it would be a $175 fee which would be fine. I would have to wire money to the escrow account. I suspect using a credit card would give me the same protection at no cost (to me) though so I will definitely check into that.