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As you probably already know, Samsung is replacing their top of the line Pro Series Black SDHC cards, which spec at 90 Mb/sec read speed and 40 Mb/sec write speed. But that means the current cards are being heavily discounted. The 16gb version is being offered for $6.99 each at the BuyDig eBay store:
16GB SDHC Pro UHS I Class 10 Samsung Memory Card Up to 90MB S | eBay
Just to be clear, this is the 16gb version of the 32gb cards being offered by Adorama at $34 for a two-pack and $67 for the 64gb version in a two-pack. Adam mentioned those in a separate post.