SanDisk offers its SanDisk 32GB Extreme UHS-I V30 Class 10 SDHC Card for $17.75. Coupon code "DNExtremeSD32G" drops it to $15.97 and unlocks free shipping. That's the lowest price we could find by $1, although we saw it for a buck less last June. It features write speeds up to 40MB/s and read speeds up to 90MB/s.