B&H has the SanDisk 128GB Ultra UHS-I SDXC card for $44.54. As a UHS-I Class 10 card, this will work well for HD video capture and that high storage capacity will store a ton of compressed HD footage that most camcorders and DSLRs capture. Check it out here at B&H Photo.
You can learn more about SD cards and what the specifications mean in Demystifying SD Cards.
Note – same price at Amazon (and prime) :)
http://www.amazon.com/SanDisk-Memory-Standard-Packaging-SDSDUNC-128G-GN6IN/dp/B0143IISD0/ref=sr_1_3?ie=UTF8&qid=1458582981&sr=8-3&keywords=SanDisk+128GB+UHS-I+SDXC
That’s an insane amount of storage space for such a low price … mind blowing how technology is progressing these days!