So I opted for a single entry "o" visa. Marriage visa. I usually got the multiple entry for the past 10 years. We fly home on the 89th day this year. My question is mostly for next year. Can I get the single entry and go to immigration and pay for another 30 days? The 1 year "o" visa is $200 where the single entry fee is $80. It may save a bit of cash but will definitely save the hassle of traveling to the border.