Toys/Babies R Us sell them but not in great quantity so they run out often.
If you don't find one then the "My Breast Friend" feeding cushion is a great option, it keeps the baby in the right place so that you are less likely to get sore. B to B sell it.
Hi, I don't know if you've purchased the Boppy yet, but I have on which I never used. It's with the ladybug cover and is presently lying on my baby's cot. If you're interested, I can sell it to you.