Great Idea Kevin!
Here are a couple of my regular suppliers:
Suppliers in the USA (export worldwide - very reasonable shipping costs)
www.mouser.com
www.digikey.com
The above 2 are massive suppliers, which means their stock has a high turnover and is always fresh from the factory - Nichicon, Panasonic, Wima, Xicon.
www.percyaudio.com
Percy has all the top-name audio-grade capacitors - Blackgate, Elna Silmic, Nichicon Muse, Auricap, Dynamicap, Solen & Axon and others.
Regards
Menahem Yachad
Learn from the mistakes of others - you'll not live long enough to make them all yourself!