Since the invention of inflation, prices for groceries have skyrocketed and rivers have become traversable. Enjoy the scenic side of economics with today's Groupon: for $35, you get a half-day raft trip through Brown's Canyon and gear rental from KODI Rafting in Buena Vista (up to a $66 total value).

KODI Rafting guides paddlers through roiling rapids, splashing and thrashing riders until faces are covered with both water and enthusiastic smiles. Half-day Brown's Canyon trips depart at 8:45 a.m., 12:45 p.m., and 1:45 p.m., leading aquatic expeditions through the tree-lined cliff faces of the Arkansas River ($56 for adults; $49 for children age 7–12). Vessels row and float through tranquil stretches of current and notorious whitewater runs such as Pinball, Zoom Flume, and Widowmaker. KODI's Arkansas River Outpost acts as a base camp where rafters check out essential safety equipment including life preservers and helmets, as well as a supplementary rental package of a wetsuit, splash jacket, booties, and an Audubon Society pamphlet on spotting rare water molecules (a $10 value). Guides chauffeur parties to their put-in points up river and provide transportation back to the outpost from the end of the run, saving guests the effort of rowing home along winding mountain roads.

Though KODI Rafting sometimes offers discounted pricing online, this Groupon is still the best deal available.