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SanDisk Extreme HD Video 16GB Class 10 SDHC for $26 + free shipping
Adorama offers the SanDisk Extreme HD Video 16GB Class 10 Secure Digital Card, model no. SDSDRX3-016G-A21, for $26.49 with free shipping. (B&H Photo-Video offers it for the same.) That's $1.66/GB and the lowest total price we could find by $3, although we saw it for a buck less last week (since expired).
2 very similar deals were also reported by some other sources:
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