Have you tried Rocky Mountain Diapers? This is a different take on a one-size pocket diaper. Instead of having snaps on the front of the diaper to change the size, the snaps are on the leg elastic. Here's a picture that somewhat captures it:
They retail for $18.50. BUT at Kelly's Closet you can get them for $12.95 and free shipping today with the code "FALLBLOG". This doesn't include an insert, but if you're a fan of pocket diapers, you already have BumGenius inserts that will work just fine.