Amazon offers Prime members the Lexar Professional 8GB Class 10 UHS-1 400x High Performance SDHC Memory Card 2-Pack, model no. LSD8GBCTBNA4002, for $10.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $8.06.) That's the lowest total price we could find by $9. It features a minimum guaranteed speed of 60MB/s. Deal ends March 14.
Update: Description corrected.