Amazon offers Prime members the Samsung 32GB Evo UHS-I Class 10 microSDXC Card with Adapter, model no. MB-ME32DA/AM, for $9.99 with free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise, shipping costs $8.02.) That's $4 off and tied with our June mention as the lowest total price we could find. It features transfer speeds of up to 80MB/s.
Note that it's expected to ship in one to two months.