Amazon offers Prime members the SanDisk Ultra 64GB Class 10 SDXC UHS-I Memory Card
, model no. SDSDUNC-064G-GN6IN, for $18.95
with free shipping
. (Non-members can spend $35 to bag free shipping; otherwise, shipping adds $8.) That's the lowest total price we could find by $3, excluding the below mention. It features transfer speeds of up to 80 MB/s.
A close price: BuyDig
offers it for $19.95 with free shipping.
It's now temporarily out of stock at Amazon, but can still be ordered at this price for delivery when available.