I have used Harris Cyclery (W. Newton MA, home of the late, great Sheldon Brown, whom I at least got to meet in person one time before he died way too young) and LooseScrews, in addition to Performance and Nashbar mail order and any of the several good LBS in my neighborhood.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069