I just saw some yesterday in our local mall - it was one of those kiosk things set up during the holidays, but larger than say a sunglasses cart, it was pretty big, set up in the central walkway of the mall. You might want to check somewhere like that.
A lot of malls sells them but they'll be pricier than getting them online. I got mine from this site Emoji Cushion Pillows. They have tons of other emoji products too.