FTC Vendors:

Excellent Parts, Research, and Design.  They are really on the cutting edge.  Subscribe to their YouTube page.  

One-stop-shop for your Control Hub and Expansion Hub.  Good parts for building and design too along with sensors compatible with the Control hub.  

All of your FTC field needs.  Great selection of chassis and wheels too.

Old school FTC building components.  Still, a great place for rookie teams to get started.