Thailand in the off-season, from May to October, is quieter and significantly cheaper. You will deal with some rain, but you gain empty temples and uncrowded beaches that are usually swamped by tourists.
We can manage the $2200 cost by using the Discover it® Cash Back card. It offers 0% intro APR for 15 months on purchases and balance transfers, which helps us spread the payments out.
This is not free money. If you have a balance left when the 15-month window ends, the bank will start charging interest on whatever remains, which can get expensive quickly.