This oatmeal sensory bin has become a favorite at our house. I keep a container of oatmeal in the cupboard just for sensory play, and it gets used over and over. If I need to keep the kids busy on a rainy day, or while I cook dinner, or if I don't feel well, etc then I throw a sheet on the floor, dump the oatmeal in a pan, and send the kids to get some scoops and bowls out of their kitchen toys. This will typically keep them both occupied for 30-40 minutes, which is unheard of around here. NOTHING has that kind of sticking power other than the TV.
Need a cheap way to keep your kids busy? Try some oatmeal!