Another option is to go to your local thrift store (Value Village, St. Vincent's, Goodwill) and look for bed skirts. These are good in two ways. 1st, tear or cut the good fabric that hangs/shows away from the white fabric that covers the top of your bottom mattress (the part you never see). Use this part of the bed skirt for stabilizer, strip quilts, etc...it is sometimes better fabric than you would think, but almost always better than dryer sheets.
The second thing: I use the good fabric that was removed from the white center part, for borders. Some bedskirts are of questionable quality. Most are probably 50 cotton/50 poly. However, if you make a regular habit of shopping for bedskirts, you will find quite a few that are nice 100% cotton . When you find these, you will have fabric that may only be about 12 to 15 inches wide, but there is no seam for a long time. There is always plenty of width for those borders, and what a joy to not have to piece your border. Especially if you are making a quilt for kids that will take a lot of abuse and have to get washed frequently, you have quick, easy and seamless borders. Regards