Where do I get married in Hannibal MO???

Ok, so the deal is I live in Phoenix AZ, however I am getting married in Hannibal, MO next year. I have never been there but that is where my fiancee's family is and close to mine as well. I have been searching the internet for venues to get married and and coming up with one or two very expensive options ( Rockliffe Mansion). Am I missing something or do I have to have a mark twain themed wedding to find a venue??? HELP!!