If Richmond isn't too far away, there's Dempsey & Co. selling used equipment. They get things at auctions and also sell on consignment. Buyer beware.
http://www.dempseyandco.com/
I'm sure there's some place in Baltimore that does the same.
As for welders, I would suggest sticking with the major U.S. brand, single-purpose machines. We got a used Syncrowave 250 setup with water cooler & accessories for a total investment of about $1,400.
BR Welding up in White Plains, MD (near Waldorf) might be a point of contact for a used welder or someone who can help with some pointers. Or stop by the Roberts Oxygen in Sterling and talk with the folks at the counter.