Sandisk Pixtor/Extreme 32GB Secure Digital (SDXC) Memory Card for $14 with free shipping code BLACKNOVEMBER .
At $0.43 per GB, this is the best deal we have ever seen on a U3-speed card.
Similar U3-speed cards sell for about $20 for a 32GB ($0.62/GB).
U3 means a guaranteed transfer rate of 30 MBytes/sec, needed for 4K video recording and fast photo taking with SLR cameras.
Here is an article and a video showing the benefits, especially less lag time between taking photos, with a U3 memory card.