Ending today, Amazon offers Prime members the SanDisk Extreme 16GB UHS-I/U3 MicroSDHC Card with Adapter, model no. SDSDQXN-016G-G46A, for $14.99 with free shipping. (Non-members can spend $35 or more to dodge the $8.09 shipping fee.) That's the lowest total price we could find by $3. It features read speeds of up to 60MB/s.