I purchased mine through ProGroup International. They broker most of the major carriers and shopped around for the best rate. Here is a link to their website http://www.progroupins.com/ Good luck
Log into your account at the Texas Realtors website. Click on the benefits tab, and choose "insurance". Texas Association of Realtors has two insurance providers as benefits partners for you to choose from.
Pearl Insurance has been very popular among TX Realtors. Here is a link to review what they offer, http://pearlinsurance.com/State-Associations/Texas