Do I have to pay an extra fee for canceling my 3-month Non-B visa to get a Tourist visa?

@SArah **********

, on the initial 90 day entry stamp of a Non-B you can stay until the last day no matter when you stopped working.

Okay IF you are on the initial 90 day stamp of your Non-B visa you don't need to cancel anything.

You just take your termination paperwork with you when you stamp out of the country (most of the time they don't ask about it but sometimes they do, so have it with you).

Then go to a thai consulate in a nearby country and BUY a single entry tourist visa if that's what you want to do.