I received a magazine in the mail from Mirco-Mark the small tool specialists. They have a website www.micromark.com and I was looking in their catalog and came across these. I think they may be small enough tips for gluing binding on. In the magazine they are $5.15 for 2 empty one ounce bottles...or $5.95 for 2 empty two ounce bottles. On the website they are a little bit more. I have looked at Joanns and Michaels, Fred Meyers (Krogers) and Walmart and couldn't find them.
Fine Glue bottle tips