Amazon offers Prime members the Sony 64GB UHS-1 Class 10 SDXC Memory Card, model no. SF64UY2/TQ, for $14.99 with free shipping. (Non-members can spend $49 to bag free shipping; otherwise, it adds $8.) That's tied with last week's mention and the lowest total price we could find by $4. It features transfer speeds up to 70MB/s.
Of note, if you need more than one, BuyDig via eBay offers a 2-pack for $29.99 with free shipping. (This is particularly notable for non-Prime members.)