Looking for parts

[Doug Ferrell]

Hi,
	I'm new to the DIY list, but have been into the synth/electronics
thing for quite some time.  I have yet to build my dream system (big
modular thing with lots of knobs), but I have been collecting circuits
for several years.  While most of these use parts that are available,
some (as I'm sure everyone knows) use those dang long-out-of-production
parts.  So, I'm wondering whether anyone knows of a source for any of
the following:  AD821, AD818, XR2209, SN94281?

Thanks,
Doug Ferrell
dferrell at adoc.xerox.com

p.s.  Are any of you located in Silicon Valley?  If so, I'd love to get
together to chat (and even see/hear your electronic projects).