The Memory card brand Transcend has entered the SDXC I U3 market for 2k and 4k video cameras with two low cost offerings:

• 128 GB High Speed 10 UHS-3 Flash Memory Card 95/60 MB/s TS128GSDU3
• 64 GB High Speed 10 UHS-3 Flash Memory Card 95/60 MB/s TS64GSDU3

Both offer a minimum sustained write speed of 30 Megabytes / second which is the minimum spec for U3 and 2k, 4k video recording. These cards should alleviate the pockets of new 4k consumer camera owners at $54.99 for 64GB and $119.99 for 128GB.

They seem to be back-ordered at the moment at Amazon and B&H but should start to appear in stock in the coming weeks.

People with a Panasonic GH4 or Sony AX100 pre-order can now get cards on a very reasonable cost.  If you need more speed you could always go for the Sandisk or Kingston alternatives.

It is good to see competition heating up in the U3 Memory card space so early on.