Lexar 32GB X 2 pack with free Lexar USB 3 reader for $28.95.

This is a really good deal for this combination of a really fast set of SD cards, plus a fast reader to go with it. I know for fact the reader is fast, and by itself used to be $30 back when I purchased it last year.

95 MB per second is also great for 4K video.

You do have to be in at an Adorama VIP member, but that's completely free and you just need to fill out a simple form along with your email address.