The cost of renting a dune buggy for a tour in Oregon can vary depending on the company and the specific tour you choose. For instance, Sandland Adventures offers a Giant Dune Buggy Tour that lasts for one hour and covers approximately 8 miles of dunes and 2 miles of ocean beach. The cost for this tour is $20 per person. It's recommended to check with the specific company for the most accurate and up-to-date pricing information.