I sold a MacMini to another MacRumors member about two weeks ago via the marketplace forums. We agreed that payment would be via post office COD. I filled out the form at my post office saying I wanted CASH which I was informed would come in the form of a money order. Fine, no big deal here. I've never had a problem with a USPS money order. About a week later, I recieved my payment in the mail in the form of a personal check. I was a little upset by this, contacted the post office and asked what I should do. They simply said to cash the check, so I deposited it into my bank account on Sept. 5th. They made $100 available on that date and the rest would be placed on hold for a week since it was an out-of-state check. Today, Sept. 13th, I get a notice from my bank in the mail saying the check was returned because of unavailable funds. The bank charged me a $32 fee for the check bouncing plus another $32 fee for each transaction I had made in the past week since I had used the $100 that was made available to me. My account is now in the red by several hundred dollars because of this bounced check. What on earth should I do?? I've sent an email to the buyer and have not recieved a response. I don't want to post his screen name here in case this is a big mix up but I get the feeling I was scammed. Is the post office somehow responsible because I had filled out the form for cash and I recieved a check?? I still have the forms that I filled out. I'm going to bring them to the post office tomorrow morning (its 6:15 here now, they are closed) and see what they have to say. **EDIT** Just noticed that the guy I sold the MacMini to has been trying to sell it to other members. Should I post his username in case this is some sort of scam??