Postal money order?

limegreen70 said

He goes to the post office, gets a money order. Then he will send it to you, you cash it and then send his part back in return.

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barracudadave67 said

If he is sending you an Postal Money Order, wait till you get the M.O., then ship him the parts, that way you wont loose out. You can deposit the M.O. anytime to your account. M.Os. are safe.
Dave

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IF you know / trust the person that is fine. However, money orders can be and often are altered. I have seen it back when I was a Western Auto Manager. It may not be easy, but it does happen. Sorry, but money orders are not always safe. Safer than checks, but not always safe.