B&H Photo offers the Sony 64GB UHS-I Class 10 Secure Digital Extended-Capacity SDXC Card, model no. SF64UY/TQMN, for $29.99 with free shipping. (Amazon charges the same with free shipping for Prime members.) That's tied with our June mention and the lowest total price we've seen this year. (It's a current low by $5.) It features read speeds of up to 40MB/s and write speeds of up to 10MB/s.