From the Toys section:
Amazon.com offers the A-DATA 16GB SDHC Secure Digital High-Capacity Class 10 Card, model no. 16GSDHC10, for $32.99 with free shipping ($2.06/GB). That’s the lowest total price we could find by $3 and the least expensive Class 10 SDHC card of its capacity we’ve seen. It features a transfer rate of up to 22MB/s.