Purchased a one-way ticket from Phuket to Bangkok for 1100 baht at a travel agency the day before I left, back in december.
The very helpful employee at the agency just filled in a form on internet. No profit for the agency involved. Unfortunately she put in the wrong date in and my ticket was non-refundable, so I had to book another one on my credit card (LOL). Total costs 2200 baht for 2 tickets .....

Still not bad I think. Next time I'll fill in the form myself though at an internet shop.
I only needed to tell the flight confirmation number at the Nokair check-in desk, which was sent to me by email and sms. Most important thing was the plane left on time.
The only downside was I did not get a can of coke in the airplane. I assume all the cheap Charlies were in front of the airplane and they just skipped the first 10 rows before handing out drinks.
I was on row 9
