Oh sheets are expensive these days. not sure if sold separately though. I tend to have a stash and like you, am not fond of it all any longer. I intend to use some as backing fabrics. I also have loads of quilt tops unfinished that I am using as backings too.
I recently bought pre-cuts from connecting threads. solids and mostly dark but I hardly have solids, so they will come in handy. on clearance of course!