You probably have some of these hanging around the house? Mine came on the front of phone books. Do you just throw them away? I don't. Magnets have some good uses around the house. Here's one.
Get yourself a strip of fabric and a strip of fusible web. They should be just slightly larger than the magnets.
Press the fabric to the fusible web. Lay the magnets, picture side down, on the fused fabric.
Cover with your pressing sheet.