One of the best kept secrets about BKK Don Muang is the inexpensive food court at the far end of Terminal 2. Start one level up from the lowest arrivals level. Go as far as you can to the southern end of Terminal 2 in the general direction of the Domestic Terminal. Walk past the bookstore on the right and around the 7-11. At the start of the long elevated "tube" that leads to the Domestic Terminal you'll see it on the right. It's clearly signed. If you find yourself looking at parked cars instead of the "tube" you are in the right spot but on the wrong level. The place is used mostly by Thai airport workers plus a few savvy travelers. It serves a wide range of Thai food so some (though not all) of the food is spice. It uses a coupon system in increments of 5 baht. Buy coupons before you choose your food drink etc. You can eat very well for 30-35 baht. And it really is delicious. A wonderful place if you just arrived and you need a meal before heading for town or if you are catching a no-frills flight that doesn't serve food. I hope they are planning something similar at the new airport.