Last summer, I found the exact rotomolded cooler I wanted at a great price for an upcoming road trip. It was perfect—and yet I nearly abandoned the purchase over the $5 shipping fee. I swallowed my frustration and clicked “buy.” Two weeks later, on that same road trip, I attended an outdoor concert at a beautiful venue along the Deschutes River and happily shelled out$18 each for two drinks and another $40 for lawn chair...