where is a good source to find size 3 crochet thread to make flags. Just plan ole red white and blue.
Redheart has 4 choices of Aunt Lydia's #3 on this link: http://redheart.com/finder/crochet?filters=tid:3019 and you can shop on their website as well.
Crafter's Gallery has Aunt Lydia's #3 on this link: http://www.craftersgallery.com/Aunt-Lydiaand39s-Fashion-Crochet-Cotton-Size-3-182/default.aspx?PageID=20&CategoryID=82&ProductID=2695&RootCatCode=03000
Herrschners has it on this link: http://www.herrschners.com/dept/Crochet+Thread/Size+3.aspx
Hope this helps.