Did it recently-same routine. 10 dollars for Myanmar etc. they do have signs up saying you need proof of on going travel etc but everyone still passing through. But more expensive than it used to be. If you speak Thai, 800 ish. Agents at the pier quoting 2-2.5 k. Alternatively there are agents in Hua Hin running these ‘trips’. I was told 5k all in by a friend that went in last couple of months