Target has Legos on Clearance for under $1

I saw several posts last night in my Zite feed stating that Target had small lego sets on clearance for 39 cents.  Today I sent Heather to our local Target to check it out.  Our Target had Atlantis, Ninjago, and City sets by the register marked for $3.99.  The price checker did not recognize the items so she tried buying 2 sets.  They rung for 99 cents.  

These small sets make great stocking stuffers, gifts and even party favors at that price.  I've read other people have found Star Wars sets for the same price. I would love to hear if other people find these and what the price is.  My first thought was that it was a mistake, but it now seems like a genuine clearance item that will surely go fast once word gets out.