Okay that's strange. Here in Udon Thani it's 2000for the retirement visa, should be 1900 but they charge 100 baht extra because they do all copies etc and don't ask you for it. Then it's 3800 if I remember correctly for the multiple entry.
That's a good question, I don't know but possibly!
Then you have to ask immigration when you get the non o.
It varies where you are how they practice the rules.
That's why I said up to 30 or 45 days before.
Here where I live in Udon Thani they will do 45 days before but other places 30 days before. Honestly don't know if they would give a non o with multiple entry.