Mouser and Allied Electronics have local locations, but the "have it in your hand before buying part" may be difficult. Electro Enterprises is an aviation specific distributor in Arlington...they have all high quality mil-spec items, but their inventory is split between DFW and Oklahoma City. For getting your hands on things, Altex in Addison has a pretty good (but not great) selection of switches, AMP connectors, contacts, termianl blocks, etc.
If you are looking for MS switches (Eaton or Microswitch style), let me know. I have a fair amount I'm not going to use on this project, and could let them go for a minimal price. I could bring them by 52F if you want to look through them. Good luck.
**Check your PMs.