2 x return coach tickets to Rewind Scotland Festival in Perthshire ?

Hi, I bought these coach tickets for the festival this Sunday but we have since managed to get a lift organised. The tickets are non refundable but I can change the names on them, and cost me 42 for the two plus a booking fee. Anyone want them for 25 ONO? They can be emailed over and printed or I can print them out if needed Thanks