Getting screwed over on a payment for a parts purchase?

Have any of you been screwed over in buying and selling over the internet and what you ultimately did about it?

Here's my story and now dilemma.

I recently purchased some parts from an ebay seller, and everything went well with the transaction.
I was a happy camper.
Then the seller informed me that he has some more parts to sell to me, if i was interested.
Sent me pictures, and then after that, i liked what i saw, and we agreed on a price for the items, and the mailman.
Sent the money thru Pay Pal, friends and family.
Now i guess that's where i made a big mistake.
Now he is telling me, the payment has never gotten into his account, and when i talk to the Pay Pal agent, she tells me money IS in his account.
So i guess now this is a he says, he said situation.
What do you do?
Just now suck it up, and realize i got screwed out of 113 bucks?
Any of you out there get taken to the cleaners, so to speak, on a deal gone wrong?
Guess this a first one on me.
Jim V.