I tend to "acquire" capacitors when required (amazing how many just "blow" in computers and power supplies) from my neighbour who is a home-based electronics designer (sensors and the like) and has a HUGE supply.
He refuses to touch unbranded stuff from eBay, but says the Panasonic ones are usually OK.
e.g.
http://www.ebay.co.uk/itm/PANASONIC-.../250910933720?