One of the better deals on Amazon today is The LEGO Batman Movie The Batwing (70916). It is currently going for $45 which is half off the regular price of $89.99. Even if you’re not a fan of TLBM, you do get a lot of great parts so it’s basically a large black parts pack. This sale price basically makes it come in at $0.04/piece.
Update: It looks like it is out of stock at this time.