Last night, worked on putting on a new zipper for my DD. Wrong size but let me tell you the price. It was $4.05 for a 30" dual zipper, an industrial strength one. I know when I go get the correct size (smaller) that I'm going to spend at least $12 for a one that won't be a dual zip nor will it be industrial strength. The zipper is probably about 7 yrs old. Point of story, I got a zipper for same DD for a pencil bag about a month ago that was nowhere near as nice as the other one that was $6 at sale price that was only 9" long.