I saw a discussion last week about the fine metal tips for a glue bottle and knew I had some somewhere. Mine are made by Plaid Enterprises (they make all those craft paints too) and are called Tip-Pen Craft Tip set. Hancock's Fabrics online has them, just use that name to search. My set came with a bottle and top and the metal tips fit perfectly on that top. I've been using it to glue baste the seams on the backing of a quilt that I'm quilting in sections...works great for that.
I also found that Lee Valley Tools has a set that includes those little accordion style glue bottles with a selection of metal tips. I used to make lamp shades and found that the accordion bottle let me dispense a continuous line of glue much more easily than squeezing a bigger bottle. They are at this link:
I've bought all kind of things from Lee Valley and always had good shopping experience with them.