When I buy stickers or other pretty embellishments to use in my art I always scan them into my computer. That way I can print them out again on sticky back paper or just on plain paper and use glue to adhere them. This way you stretch your $$ and can use favorite stickers over and over again.
I also do this with other ephemera...pictures from magazines, old papers, sheet music, etc. It lets me be a little less anxious about using a favorite sticker or embellishment because I know I can print another one later.