Walmart offers the Samsung 64GB Evo UHS-I Class 10 microSDXC Card with Adapter, model no. MB-MP64DAT, for $17.57. Opt for in-store pickup to dodge the $4.97 shipping fee. That's a buck under our mention from three weeks ago and the lowest price we've seen. (It's also a current low by $3.) It features data transfer speeds of up to 48MB/s.