BuyDig offers the Lexar 32GB UHS-1 microSDHC Memory Card with USB 3.0 Reader, model no. LSDMI32GBB1NL633R, for $12.95 with free shipping. (Amazon has it for the same price with free shipping for Prime members.) That's the lowest total price we could find by $5. It features transfer speed up to 95MB/s.

Update: The price has increased at BuyDig; however, Amazon still offers it for $12.95 with free shipping for Prime members.