Vince T.
Yelp
Mode Moderne is our favorite place to browse and buy furniture in all of Philly. They constantly find and bring in great classic pieces from the mid-modern period. Many pieces in great condition by the usual suspects (Eames, Nelson, Saarinen, etc), as well as lovely gems from lesser known places. We picked up a beautifully retro Pierre Jeanneret scissor chair for a bargain.
Michael and Michael (the two owners) know their stuff, inside and out. Always helpful and willing to make a recommendation. They have access to a great re-upholsterer as well!
If you're seriously looking, ask what their best price is and you may be pleasantly surprised - a piece you thought was out of your budget suddenly is affordable!
They also have the full HERMAN MILLER or KNOLL catalogs in store and if they don't have it at present, they can order it for you, again at a better value than buying straight from the website online.