For anyone who has a A500/501 (and possibly the A100) the desktop stand is going real cheap (just under $11, down from the ridiculous $70 or so they used to be!) at Dick Smiths at the moment:

Store stock only by the looks of things.

Unfortunately this is just the charging/audio stand - the one with HDMI seems to be a unicorn in NZ... But not bad for the price!

Usefully the tablet can actually be put into the stand while inside the standard Acer flip case which is kinda handy.