Transcend 32GB Class 10 SDHC for $13 + free shipping via Prime
Amazon offers Prime members the Transcend 32GB Class 10 Secure Digital High-Capacity Memory Card, model no. TS32GSDHC10E, for $12.99 with free shipping. (Non-members can spend $35 or more to bag free shipping; otherwise, it adds $8.06.) That's the lowest total price we could find by $2.
2 very similar deals were also reported by some other sources: