Adorama offers the SanDisk 32GB 32GB Extreme UHS-I Class U-1 microSDHC Card, model no. SDSDQXL-032G-A46A, for $16.95 with free shipping. That's $5 below our September mention and the lowest total price we've seen. (Aside from the mention below, it's a current low by $7.) It features read and write speeds of up to 45MB/s.
A close price: Amazon sells this card for $17.99 with free shipping for Prime members.