I have been told on a few occasions by condo owners from Australia that before purchasing in Thailand, do the following:

1/ Spend a few weeks in the town were you are looking at buying.
2/ Visit different real estate offices in that town especially the small ones.
3/ NEVER purchase online / without inspection.

Reason:

When you purchase or enquire online you will be paying up to double the real price of the condo. Bigger RE offices know our dollar buys a lot of property so try to put one over us, even farang consultants.

You will be more amazed at the real price once you look around, yes there are condo's available for @ $30 - $50k around Chiang Mai.

Be very very careful and seek a trusted lawyer (if there is one)

Make sure you don't stick your meat where you keep your veges or you'll lose your condo in the end