DDR3 SDRAM and NAND flash memory substitution

[asgard]

I am in process of recreating the OLINUXINO A13 WIFI with a few changes.  One thing is I make the Microchip 802.11b/g/n module integral to the main board instead of on a riser.  Additional devices are set up to allow use as an industrial PID controller for process controls (reassigning some of the LCD pins to general ports is one way I think this will work, another way might possibly be to reuse GPIO0-4 as additional SPI CS pins for expansion.

To reclaim board real-estate I have done away with the VGA components.  I may yet decide whether to retain the USB-Host parts as well.  I have also put a coin-cell holder for the RTC as an option.

One big hurdle I have come across here is that the SK Hynix memory parts are not available in the normal channels (Mouser or Digikey).  Could somebody recommend substitutions?

Thanks muchly.
J.R. Stoner
BDG
http://www.bifrost-group.com