There is a spray you can do yourself: Taurus SC: Best Overall
Active Ingredient: Fipronil
Lasts For: Up to 10 years
Works As Fast As: Less than three months
I used a garden spray around the house and between the floorboards both upstairs and downstairs. This is what the professionals use, must have Fipronil as this sticks to the termite's legs and transfers it to the nest in turn killing the queen. Haven't had any problems since. I respray once a year just to be safe. dilutes something like 1 to 100, very effective.
If you can't find this then get one with Fipronil.
Here is the guide but I didn't dig a trench:
Taurus SC is a highly concentrated, liquid termite killer that is applied to a trench around your house’s perimeter. For best results, dig a six-inch trench around your home’s perimeter, pour the solution in approximately every ten feet, and wait for your results.
Taurus SC is a highly-effective termite killer because termites cannot detect it, so they walk over the liquid and bring the poison back to the termite colony with them. This leads to other termites being contaminated with Taurus SC and eventually eradicates the colony. It also works against wasps, ants, centipedes, roaches, and other pests as well.