If you funded your PayPal payment with a credit card, contact the card's issuer now and see if it's possible to file a chargeback--a charge dispute for goods ordered and paid for but not received. You may be beyond the time period for doing that, but it's worth a shot. Be sure you have your credit card statement with the charge on it for reference when you make your call.
If you didn't use a credit card with your PayPal payment, I'm afraid you're SOL.