Ok, thank you!
I sent over a PayPal invoice this way it is coming directly from PayPal instead of waiting on him to send me the payment.
I know this is not a fraud order; I did some research online and everything ties to this being a valid order, so basically he has just "stolen" my merchandise.
If I don't hear a response from him towards the PayPal invoice, I'll try looking for a UK debt collection agency to see if they can help me out. I don't mind paying a commission, as long as this guy doesn't get away for not paying for the merchandise.
Also, has anyone ever tried to get the police involved internationally with success?
I feel like since I'm from the US that I won't be able to make much headway trying to contact his local UK police department.