It appears the letter of the day at Target is D, with a new sale featuring the delightful trio of Dots, Duplo and Disney all reduced. This also includes the Mickey and Minnie buildable characters set (but not the Disney art set).
You’ll be able to get 20% off sets from these themes until February 17th.
Here are some links to everything on offer: Dots, Duplo, Disney Princess, Disney Frozen, Mickey & Minnie
There’s no specific mention of this being an online only sale so you should be able to find these prices in-store too.