I have got my last 2 multi entry Non-O visas based on marriage at the Savannakhet Consulate (last one was early August this year). B5,000 each time. You can only stay in thailand for 90 days each time though. Not a problem for me as i travel outside for work. As the the visa is multi entry, you do not need to get Re-Entry Permits... Minimal documentation is required, no bank statements (check their website for the latest documents though, seeing other posters have said things have changed.) Don't go on a Monday or straight after a public holiday, as many people. Other days you'll be in & out within 15 - 30 minutes max.
Go straight to an airport and fly out to Singapore or KL. Pay the B15,000 and you will be ok. Just don't get caught before you get to the airport... lol 😆 🤣 😂