I'm big on "frugality." (see: http://theshoestring.com/index.php?a...§ionID=146
I live in a city of about pop.1,000,000. It's not huge but it has about 30 local bike shops.
It also has at least 2 "bike dumps" and one bike recycler.
(I link to those so you have an idea what's out there)
I gotta believe every major city has one or more similar businesses.
Some of them are open to part swaps, others won't be.
Another source: THE TRASH! Night before garbage day (in the summer at least), I'll cruise around scoping the curb. To date, I've found a dozen bikes. Many get donated to my local bike dump - in exchange, they've given me certain "picking rights" to their parts bins. (I've scored sets of gull-wing and moustache bars from them and even been paid for a few things)
Finally, there's your local "FreeCycle" groups. I scored a very nice 1970's Sekine 10-speed which I donated - not before I took the near-mint-condition Brooks Competition saddle off first! Do a Yahoo-groups search for "freecycle" + your city name. The website(s) will explain all you need to know.
The only thing money buys you is "nowness." You can go to a bike shop and throw money around and have what you want "now." If you bide your time, look in the right places and let people know what you're after, that you don't have a budget but have some things to trade, your patience will pay off - eventually.
Also: folks here on bikeforums.net might do the swap thing. I hadn't thought about that...
I've got some stuff I want to get rid of and other stuff I need so if anyone's interested: