So ( as an absolute bare minimum) after transport and accomodation ( that's AFTER ) you need at least 10k baht per week x 4 = 40 k say plus 15k plus 10 = 65 k for an individual , now this is also the amount needed for you Visa , for 2 people , times it by 2 .
First time , I paid 33k for 15 months , but that was with multiple exit which was 4.3k from memory ..
A very reasonable agent , therefore for 15 months , bank account set , etc etc so that's around 29k with no exit , and that's a good deal , certainly in our local office .