I've purchased 1/4" and walking feet at sewclassic.com. She has a walking foot that lines up perfectly with the FW feed dog. And you can get bobbins from her as well. They will fit and not give you problems. I had some bobbins from JoAnns and they didn't work..... made the stitching loopy. Others have had problems with bobbins purchased from walmarts as well.... Good luck.

Try Joanns, that is where I got mine