Michael's Sale on Foam Shapes/Stickers
I bought a bucket of the foam stickers for Amy's birthday party and the kids loved them! They were $7.99 for the bucket and it was FULL of them. Even having stickering sessions in our house a few times a week since has only gotten us halfway down the bucket. They come in colorful shapes and different themes. There is also a bigger varietyu of plain foam shapes that you have to glue.
Anyhow, the buckets are on sale for $4 through the weekend. I just got back from picking up 5 of them. This is a pretty cheap price to keep your toddler occupied for 30 minutes or so!