Can I still get a 30-day tourist visa at Mae Sai, Myanmar?

Yes, you can get a 30-day visa exempt entry stamp at the Mae Sai-Tachiliek border as long as you haven't already used two 30-day visa-exempt entries by land in the same year. There is a fee of 500 baht (or a pristine $10 bill) for stamping in and out of Myanmar. Additionally, you can extend the 30-day entry once for another 30 days at an immigration office for 1900 baht. If you have a specific entry history, you should not encounter any problems.