I buy flat sheets from Target....(Threshold brand...300 thread count)...they wash beautifully...not a huge assortment of colors (I think there are 10 or 11 colors)...I watch for them to be on sale...either in the store, or order on line and pick up in the store...when they go on sale even king size is less than $20...which in MHO is a good price.... I've not had any trouble long arming them...and use the "scraps" for piecing or binding.