SanDisk and Lexar each have some deals going on today. SanDisk's Extreme SD cards with transfer rates of up to 90 MB/s are available at great prices at Amazon in sizes from 16 GB to 256 GB. Meanwhile, Lexar's super fast Professional 2933x XQD cards are an astounding 50 percent off at B&H (Amazon's prices are more than double).
The Lexar XQD cards that are on sale are very highly rated, but do note that the negative reviews for the line on B&H are all because they do not work with the Sony FS7. Therefore, it's naturally recommended to avoid these cards if that's what you're buying them for. Meanwhile, Nikon users seem to be quite pleased. The 2933x cards come in 32 GB, 64 GB, and 128 GB capacities.