Here's the best thing you can do with $100: Write a check for $50 (or give cash) directly to the troop as a donation. Buy a bag or two of popcorn from the grocery store for yourself. Keep $40 in your wallet.
You have just doubled the collection for the troop, saved the scoutmaster from the work of processing and delivering your order, and kept $40 that you could donate to Free Republic.
i have done that- just given the troop $$ instead of purchasing stuff at a booth.