I just bought some good(not high) quality, eg, Elna, Roedenstein, off Ebay, these are new old stocks at a very good price, less then the retail price, esp from RS components. eg 5600uF for $2.20 compare to $12.00 for 10,000uF from RS components. I am using them for building 6 channels amp. I will report if quality is not good.
I find components from Farnell are general cheaper than RS. Just bought some op amp from them eg. AD818(single) and AD828(dual) about $8.00 each very reasonable for this type of op-amp, it sounds quite good, do try them, a direct replacement of any I to V op-amp in DAC or Cd player.