New Sandisk Extreme PRO SD cards finally available for preorder at Amazon and BHphoto

The new Sandisk Extreme PRO cards have a write and read speed of 300MB/s. It comes in different capacities:

• 128GB for $134 at Amazon US&EU, BHphoto.
• 256GB for $229 at Amazon US&EU, BHphoto.
• 512GB for $519 at Amazon US&EU, BHphoto.