Boom: http://www.bhphotovideo.com/c/product/580065-REG/Sony_HVR_MRC1_HVR_MRC1_MEMORY_RECORDING_UNIT.html
850 at B&H.
I canada vistek sells it.
Thanks for the heads up on the pre-order! I know that this records simultaneously with tape and that the Z7 has a built in only to CF option, but is there a way to record only to CF on the A1?
Also, what specifically what bracket are you using to attach the unit to the A1 in your pictures?
http://lh3.ggpht.com/_8QYQTf93sl8/R9hpb1DTNFI/AAAAAAAAAE0/T4bMfw3llAA/s720/DSC00021.JPG