If i contract with TeachersASAP, is my facility required to use TeachersASAP exclusively?

No.   Once you are a client of TeachesASAP and establish an account, you are free to use our services as you see best.  While we have service standards, it is an at-will use.   If you have other methods of finding substitutes, you are able to continue to use those avenues.   It is our goal to earn your business and will strive to be your best source for substitute placement.