Walmart offers the SanDisk 64GB Extreme Pro U3 Class 10 SDXC Memory Card, model no. SDSDXPA-064G-X46, for $33.95. (Amazon and Adorama charge the same.) Opt for in-store pickup to dodge a $4.97 shipping fee. That's $10 under our mention from last November and the lowest total price we could find by $4. It features read speeds up to 95MB/s.