There was a thread about this here:
viewtopic.php?f=7&t=9432
but it died out. I have the 540. This is a great device, and I would love to have Archlinux ARM on this device.
All of these have basically the same hardware. The 520 is currently 130€ on german ebay.
According to that thread, $105 have already been donated towards this.
I'm not from the US; where would it need to be bought, and how much is it currently?
What else do you need to make this happen?
More Information: http://zyxel.nas-central.org/wiki/Category:NAS540