Investigate QR code vouchers
Provide private keys of pre-filled wallets. The private keys could be sold at http://k.osalliance.com/ipn/process.php?item_number=FC200 This is already connected to Paypal and works. They can be very easily cleared with the FairCoin Android App. Private Keys may be too long as vouchers in the shop, so they could be stored as QR codes on web server with a hashed URL.