Sourcing of good capacitors.

Help please....
I am busy trying to restore an old valve power amp and I find difficulty in sourcing the correct capacitors. Would the AVSA brains trust please advise me as to where good audio capacitors can be obtained???  I live in the Pretoria Johannesburg area and have tried RS comps, Electronis321 and Communica with no satisactory results. Where does Ampdog, LAV, and all the main diy amp builders buy their capacitors. Much appreciated for any suggestions given,

mike.