I have also been checking throughout the last 3-4 weeks, and in the last 2-3 weeks there have been none.
I would suppose that less people are buying the mini because it is out of date, hence there are less returns, and therefore there are less refurbished minis available?
I am hoping it is indicative of an impending update, because at the moment, the mini is sorely underpowered for the price. 🙁
To give Apple a little credit, they do have to organise simultaneous 'secret 🙄' worldwide shipping of the new Minis (or any new Mac), plus have 'spot on' projections for demand, and the current Mini will suit most customers just fine.
Peace and God Bless,