How much do Thais usually have to put down when buying a house or a condo? Also, what is a typical interest rate and repayment period?

Secondly, are there any banks still making loans availble to foreigners to buy condos under US$100,000?

All depends on individuals but for houses they can get up to 95% loans over 25 years, for condo's they can get up to 80%.

However if the maximum amount that can be lent on luxury property (defined as > Baht 10Mn) is 70% regardless of type.

Lending rates are between 7-8%

In answer to your second question, not that I know of. But you want to look into alternative financing solutions like Hampton's International Mortgages, who lend here. I do not have specific details on how it works but will do so shortly and report back.

Some of the Thai bank websites have online mortgage calculators that should give you an idea of deposits required and monthly repayments.

This is the website for the bangkok bank

http://www.bangkokbank.com/Bangkok+Bank/We...+Calculator.htm

Thanks for the good info!