B&H Photo Video has great 2-pack SanDisk deals:
B&H has 2-Packs of SanDisk 64GB Extreme Pro UHS-I SDXC U-3 for $79.95. These are UHS class 3 cards rated at 95 MB/s read and 90 MB/s write. Excellent savings, just one card goes for $55!
B&H also has 2-Packs of SanDisk 64GB Extreme CompactFlash for $99.99. These are UDMA 7 cards rated at 120 MB/s read and 85 MB/s write, slightly slower (but less expensive) than the recent Lexar card deals.