At my Costco, I just bought a Hanna Andersson short sleeve knit dress for $14! They were on the back of the tall rack of Easter dresses. Solids, stripes, floral and a pucci-like print. I think it was sizes 2-7 (I bought a sz 110 and the biggest one I found was sz 120). I think a couple might have been sleeveless. There was a whole rack, I am pretty sure it was put out recently, I shop there once a week.
eta: added pictures in post 16 & 81