I got some at Hobby Lobby. Testors brand. 5 disposable plastic tips. I use them with Sharon's gluing method. Worked fine for me and glue line was fine enough for me. Cost for five was 1.99 + tax. Maybe I found them in the art supply dept. Look around. I know they are there. Ask if necessary.
Bar code 75611 88050
8805 is in top left side of pkg. Size of pkg is approx 6 1/2 in x 2 3/4 in. Top of pkg is orange/red shading to lightest orange shebert at bottom.
You can see a pkg on ebay selling for over $3. Could probably order from Testor Corp but why pay shipping? Just go to Hobby Lobby.