When the Mistletoe Troop in Muskogee, Oklahoma, sold the first batch of Girl Scout cookies in 1917, it was 25 cents for a dozen. Now it's $5 per package, and $6 for the gluten-free ones (at least someone's getting a cost-of-living raise.) But the price isn't the only thing that's changed over the last hundred years of Girl Scout cookie sales. The way they're selling them has changed too.