As one of its daily deals, Amazon offers Prime members the Lexar Professional 64GB 1000x UHS-II/U3 SDXC Card, model no. LSD64GCRBNA1000, for $29.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $8.) That's the lowest total price we could find by $9. It features a data transfer speed of up to 150MB/s.

It's also available in 128GB for $52.99 with free shipping. That's another price low, this time by $17, although we saw it for $3 less in November. Both deals end today.