arrived in bangkok on 8 feb and booked a Test & Go package at Grand Hyatt Erawan. very seamless process- I suppose I may have just gotten lucky but my test only took 3 hours to come back (I didn't pay for express). test is done at the hotel, with results by BNH Hospital, and the certificate has enough details that it can be used as a pre-departure test (well, for Singapore at least) if needed.

I'm only a hyatt discoverist but got upgraded to a club room with club privileges.