I am presently rehabillitating an old stareo receiver, feeding it a collection of new electrolytic capacitors.
I source a lot of stuff from Parts Connexion's e-site. They are pysically local to me, but actually seem to mostly deal with audio modify and repair folks all over the world.
In their bargain basement section of the e-store at the moment are some large capacitors of the sort found in studio flash for some very attractive prices.
I am mulling rpreemptively stocking up for the inevitable day that my old Speedotron studio flash spits out dead caps.