I would check online JoannFabrics, Walmart, and Amazon on Black Friday to see what kinds of deals they are offering. With both Joann's and Walmart, you can order online and specify pickup at the store of your choice so you don't have to pay shipping. Makes it a lot easier than fighting the crowds.
This year many stores are not opening until 8:00am Friday morning, but online they will probably start their sales at midnight. Also, many stores are running pre-Black Friday sales already. Maybe check out a few places, jot down prices on battings you are interested in, and check back daily to see if you can catch a deal.