@Terje *********
, I haven't yet found one where the shorter, cheaper courses are accredited by the MOE. The one you posted above says they are but at 70,000 Baht. I just got a reply from The Food School Bangkok: Their course is 3-9 months and costs 224,500 all in. If you look at the monthly cost of the 70K option for the next 5 years, it's only 1167 a month. It's a lot upfront, but it's a pretty reasonable and cheap option in the long run, and you learn a new skill.