I bought mine at Best Buy when they were closing them out. There used to be quite a collection for sale on ebay, but that's no longer there either.
If you visit www.ebates.com
and follow the link to the eCost store (after doing a search by product for Audiotron), you'll find a unit that, after the rebate, runs about $270, still not much of a discount off the $299.95 msrp.
That said, this thing is worth $300.