Newegg offers the Adata 64GB Premier UHS-I Class 10 microSDXC Card, model no. AUSDX64GUICL10-RA1, for $24.99. Coupon code "EMCAVPA47" cuts it to $18.99. With 99 cents for shipping, that's tied with our mention from two weeks ago and the lowest total price we could find. (It's a current low by $5.) It includes an SD card adapter. Deal ends August 5.
B&H Photo Video offers the Sony 32GB UHS-I Class 10 SDHC Secure Digital High-Capacity Card, model no. SF32UY/TQMN, for $9.95 with free shipping. That's tied with our mention from a month ago and the best price we've seen. (It's also a current low by $5.) It features read speeds of up to 40MB/s and write speeds of up to 10MB/s.