Today only, Best Buy offers the PNY StorEDGE 64GB SDXC Secure Digital Extended-Capacity Card for Apple MacBooks and Ultra-Thin Laptops, model no. P-MEMEXP64U1-EF, for $39.99 with free shipping ($0.62/GB). (Amazon charges the same.) That's $10 under our September mention and the lowest total price we could find by $16. It features a data transfer rate of up to 60MB/second.