Here, maybe this will help. On this blog site the person if you read past how they did all their grafting and pics to the comments section, one person said they used binder clips from the office supply store and in the post underneath, the original blogger said they have used them too in a pinch for several years before the metal rusts on them.
Also, if you have a local garden supply center or a hardware store they might carr some grafting supplies.
May sound crazy, but also check out the hair barrettes section in like Walmart or other box stores. Might find some small enough that will work too.
http://curbstonevalley.com/blog/?p=9562