What is a USPS mail order?

[Distortion]

This is probably a dumb question to most of you but, I'm going to order some supplies and I dont want to use my credit card. There is an option to use a USPS mail order. How does this work?

 

[kbrkbr]

They probably mean USPS money order.

 

[Mulk]

United States Postal Service. Doh!! lol Good luck.