This should keep you busy for a little while. My passion is SET amps so this biased in that direction.
http://www.angela.com/
https://secure.tubesandmore.com/
http://bottlehead.com/
http://www.diyhifisupply.com/
http://www.diycable.com/main/default.php
http://www.mouser.com/
http://members.aol.com/sbench101/
http://www.pmillett.com/
http://experiencemusic.net/
http://www.curcioaudio.com/index.htm
http://www.dddac.de/
http://www.percyaudio.com/Catalog.pdf
http://www.alliedelec.com/Default.asp
http://www.sowter.co.uk/
http://partsconnexion.com/
http://electra-print.com/
http://www.users.qwest.net/~tubes/
http://home.tiscali.nl/~t708955/triode.htm
http://www.tubecad.com/
http://www.angela.com/
https://secure.tubesandmore.com/
http://bottlehead.com/
http://www.diyhifisupply.com/
http://www.diycable.com/main/default.php
http://www.mouser.com/
http://members.aol.com/sbench101/
http://www.pmillett.com/
http://experiencemusic.net/
http://www.curcioaudio.com/index.htm
http://www.dddac.de/
http://www.percyaudio.com/Catalog.pdf
http://www.alliedelec.com/Default.asp
http://www.sowter.co.uk/
http://partsconnexion.com/
http://electra-print.com/
http://www.users.qwest.net/~tubes/
http://home.tiscali.nl/~t708955/triode.htm
http://www.tubecad.com/