ZIPS 25-30cm & 50-55cm lengths (Shepaprton 3630)

Hi, I work with a group of ladies who sew for a "Not for profit organisation". We are running out of zips so does anyone have zip that you are no longer using, I'm looking for as many as I can get. Must be working order and any colour is ok. we need sizes 25-30cm long and 40 -55cm long. Its for group that sewing stuff for Children's Christmas presents. I come to Melbourne most months so could collect on that day. Hope you can help. Thank you, Fiona