I was in my local Wally World and of course I had to go through the camping section. I noticed they had little boxes of cord locks. A pack of 4 was only 58 cents. The eliptical shape and nice size too. That is the cheapest I have seen them.
Right next to them were little boxes of zipper pulls. Also .58 for 4.
Now if I could just find that dollar fabric bin everybody keeps talking about