There are 71 convertibles under $10K within 100 miles of me right now, per Cars.com. Among them: a 09 A4 with 79K, 08 Saab 9-3 with 60K, 08 A4 with 60K, 03 Volvo C70 with 55K, 98 Z3 with 55K, and even if you absolutely had to have a 30-year old GM product...a 92 Allante with 60K.