You can request a VAT refund. The prerequisite for a refund is that the invoice address is in a country outside the EU and the delivery address in Germany. Please contact the customs office to request a goods export form. Make sure to get your invoice stamped by customs when you export the goods. All you have to do then is to send them the stamped original (not a copy or scan!) of the invoice. The VAT refund will be credited to your credit card or PayPal account. Please note that you will be liable for the fees for prepayment or cash on delivery orders and do not have a German or EU bank account.