Leon Otis and Sadie A.

Hello everyone! I'm trying to find marriage records for the following people, and am not having much luck. Leon and Sadie appear in the 1910 census with a daughter, 7months. I can't make out how long they have been married, but they are in Newfield, Rockingham, NH. In 1920, Sadie appears with her daughter and two other Otis children (Whalen and a Leon W.) but now she's married to David P. Sands (the record on ancestry is hard to read and ancestry has them as 'Sanda'. David and Sadie could be my grandmother's parents, but I'm trying to track down the marriage records and birth certificates... but I can't even find them! I don't live in NH, and don't have the money to waste calling them up and guessing..... Can anyone help me?