Amazon offers Prime members the PNY 16GB Elite Performance Class 10 Secure Digital High-Capacity Memory Card (pictured), model no. P-SDH16U1H-GE, for $8.99 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $8.) That's tied with our mention from last summer and the lowest total price we could find now by $3, outside of the mention below. It features read speeds of up to 30MB/s and write speeds up to 35MB/s.
A close price: Best Buy offers it for $9.99 with free shipping.