zBook G2 Owners - Alternatives to "Z Turbo Drive"?

Does anyone happen to know if there are alternatives to the Z Turbo Drive offered in the new zBook 15 and 17 G2? I know this is a SanDisk A110 2260 M.2 PCIe drive and really need 512GB or higher. Unfortunately I have had zero luck tracking down any other 2260 PCIe drives and hoped someone else here may have had better luck.

Thanks!

2015.02.11 Update: For those with similar questions, to save you from reading the entire thread, it looks like the interface in the ZBook G2 is a PCI-E...

zBook G2 Owners - Alternatives to "Z Turbo Drive"?