I've made two of these and used poly pellets bought at Hobby Lobby and Michaels. Hobby Lobby has 1# bags and Michaels 2 # bags. Use coupons as this can get expensive. Michael's will accept JoAnns coupons. You will also need some poly fill to keep the pellets in place while you sew the seam. The machine doesn't like hitting a pellet it goes into overload. I used 10% of the child's weight plus 1# as that is what the OT recommended. You will need a small kitchen scale to measure small amounts of pellets as you need to divide the pellets into each square. I also found a funnel to be of great help. Don't be surprised if you are sweeping up pellets months after you made the blanket. Good luck.