Membership in The Interlocal Purchasing System is Free. Membership for Texas Entities requires an Interlocal Agreement. Online membership enrollment is not permitted.
Download the documents required by your entity and submit to TIPS for membership.

Interlocal Agreement - Schools and Other Agencies 

If your organization requires a Board Resolution for the approval of the Interlocal Agreement it can be downloaded here: Board Resolution
The authority for the use of an Interlocal Agreement to satisfy the Texas bidding requirements can be downloaded here: Authority