I spent weeks trying to find stitch markers for my size 0 to 5-0 needles. Regular ones were way too big! I tried making tiny loops of thread--that worked but was very tedious. Finally one day, I was in a craft store and wandered by the jewelry findings. I ended up buying a small bag of about a dozen gold jump rings for about a dollar. They work wonderfully! I keep them stored on a safety pin when not in use.
Wendy Sue A Knitting Fool in CT