We stopped at a Dollar General while on vacation over the weekend and found these sets for $5. There are at least 4 different ones with between 73 and 84 pieces each. I bought 2 and each looks to have 3 Kre-o Transformer minifigures and some additional building pieces without any instructions. It's not a bad deal for the money. There's one with Megatron on the box, but that one looks to include only a minifigure of him.
kre-o.jpg
https://buildinguptosomething.wordpr...96182312-asst/
kre-o.jpg
https://buildinguptosomething.wordpr...96182312-asst/