that is why they only sell them to a maximum of several hundred dollars, so bigger items may require several money orders, you can also just have the post office verify there authenticity of the money order before depositing them in the bank if the purchase price is higher a certified bank check from a national bank is a good option
point is pay pal is not the best option it does work most of the time but there are better safer options
this also only applies to U.S. POST OFFICE money orders not ones from the corner store