Originally Posted by
dsquared37
You are not forced directly to immigration when getting off the plane and so can purchase anything. I often will buy 2x 1L Johnny Red (1000 Baht) before heading into town.
I knew I could make it up to the duty free but was once told only if I was departing so I never tried again. I will have to make sure to try again as the prices are much better than the in town prices for sure.