Most of mine are NOVA Based, I do all of my own work so these are mostly vendors and sources. Like John Smith, I also like TSC, here are a few of my favorites:
Welding - Arcet Equipment on Euclid in Manassas. Charlie, Chuck, Devon and the gang are amazing. I've learned more from them that I did in welding school. Every time I go there, I learn something.
Steel - BMG Metals in Manassas. Great prices and free delivery if you meet the minimum order. Saves the hassle of cutting stuff up to take it home.
Steel in MD (and Tools) Posner Industries.
OEM Toyota Parts - Browns Toyota in Glenn Burnie has a great mail order parts department.
Power Coating - Extreme Power Coating in Springfield/Lorton and Goose Creek Finishing near Leesburg in Waterford. Does small sand blast jobs but not major ones.
Paint - Vienna Autobody. Chris is a nice guy.
Radiator and Gas tank reseal/repair Dolphin Auto Repair 703-750-0985
There is a Czech guy in Manasas that does alternators and starts, I'll dig up his info. Jim took his HJ45 starter there and it worked out great.
Speedshop - Power House - Bill Mathis
Sandblasting and Powdercoating - Sandblast America in Manassas, ask for Jeff (703) 392-5570 For you restoration folks, he can sand blast and primer.
I'm currently looking for someone who does plastic media blasting and or dry ice blasting in the area. There used to be some outfits but they have closed.
There used to be a chem dip place in Upper Marlboro Md but not anymore as far as I know? Anyone?
Tires- Costo for BFG! But bring the wheels off the truck or you'll find their a stickler for OEM size. Just tell them it's for a vintage WWII Dodge Command Car.
Tires- Super Swamper - National Tire and Wheel in Wheeling WV 1-800-847-3287 ask for Carl. You get the tires in two days and they have cheap shipping and no sales tax. I have them mounted at Costco, BJ's or Sam's club. I've been buying Super Swampers from them for 24 years. Great vendor. Also sells Skyjacker, etc.
Snapon Tools -Mike Cole 703-929-3835
Matco Tools - Billie Creed 703-203-7086
Rust Repair - Georg's Automotive Restoration in Great Falls 703-969-1715 this guy has a college degree in Automotive Restoration. How cool is that? Fair prices and good work. He works on my friend's Model A and is a Ford Specialist but if you go there, there are all sorts of cars being worked on.
Out of the area:
Marksoffroad.net used parts, cool stuff and OEM/Aftermarket new. The guru.
Carbs, Mark above and Jim C. both on this board.
Bodies - Todd and Domineke at Aqualu are super nice people.
SOR.COM the Home Depot of Land Cruiser parts. Not the best prices, not the worse prices but they have everything and then some.
Eastwood.com - restoration supplies. I like their rust encapsulator paint.
Autobody Supplies: Mattos locally or
Auto Body Toolmart - Paint Booth, Shop Equipment, Dent Repair Tools online
-Stumbaugh