THey show up pretty regularly in the US refurb store. My supposition has always been that they wait until the refurb factory has a batch of X units before they add them to the store.
So none showing up for a while might just mean that people hadn't been returning many for a while.
But they don't show up as reguarly in the Aus, German, and other stores...
and i have been waiting forever to buy one and now I have enough cash I'm gonna make this worth it. I start high school next year and I don't think my Acer lappy will last me long enough seeing as how I beat it like a red headed step-child taking it everywhere with me! The abomination finally came crawling back from Acer repair yesterday and I'm giving it a last meal by using it hard one last time before I sell it to my dad (I've sent it back to repair 3 times!)