Thanks to Debby for this Frugal Baby Tip!
I've used the Kushies liners (on the roll). They are thick and pretty soft. I like them because they are flushable. I've never tried washing and reusing the wet ones. Since they are pretty spendy and we go thru them pretty quickly, I don't use them that often.
I've also used the Gerber liners (sold in a box). They are not flushable, but I know some people do wash them and reuse them.
What I've ended up doing is buying really cheap receiving blankets and cutting them into squares. I zigzag the edges. When they are pooped on, I just rinse them and wash them with the diapers. This works best for us. I like how soft they are!