I did a lot of shopping around on Etsy and I finally decided on these two sets to start with so I could test them out. The polka dot ones are from Pleat and you can find them right here. The white ones are from gogreengirl and you can get them here. I got the sets that have a liner, a regular pad, and an overnight pad.
I haven't been able to try them yet, but they all look very well made and up for the task. ;)And looking at them in person I think they would be pretty easy to make myself.