Amazon.com has PNY U3 MicroSDXC Class 10 Memory Card on sale. Shipping is free with Prime or if you spend $35 or more.

• PNY U3 MicroSDXC Class 10 Memory Card
  • 64GB $19.99
    • Note: Now ships in 1 to 4 weeks
  • 32GB $10.99
  • Note: May require an extra 1 to 2 days to process