Just got back to Thailand today. In Padang Besar, I was first told to stay in Malaysia for 3 days and then come back to Thailand (I tried to re-enter Thailand after being in Malaysia for about 15 minutes ????)
Someone who offered us a ride to Hat Yai went to talk to some people who just hang around the building and I was told that, for 2,500 thb, I can re-enter Thailand immediately. I know there would have been other options but just wanted to take the easiest route this time. I gave the money to that old man who first I thought was homeless.. After I paid, we both went back to the same immigration officer again, and they gladly stamped me in.
So, 2500 thb seems to be the current price ????