Best Buy offers the PNY StorEDGE 64GB SDXC Secure Digital Extended-Capacity Card for Standard Laptops, model no. P-ULTRA64U1-GE, for $25.99 with free shipping. That's tied with our Black Friday week mention and the lowest total in-stock price we could find by $14, outside of the mention below. It features a data transfer rate of up to 60MB/second.
A low price: Universal Goods & Electronics via Amazon charges $19.99 with free shipping for Prime members, although stock is very limited.