Professional termite control is expensive because it is labor intensive and the chemicals are costly. The companies also generally provide warranties and return service. It is possible to save significant money to DIY termite control, but you must be prepared to use enough of the expensive chemical, and take the time to apply it correctly, or it will just be wasted, and your home unprotected. Be prepared to do trenching, drilling and other means to get the chemical where it needs to be applied and figure on about one dollar per linear foot of foundation for preparation and treatment.

Professional quality products may be purchased, and there is good information at the following link. I have used products from this company and have found it to be much better than what the average homeowner can buy in a store. http://www.bugspray.com/article/termites.html