I just got a pretty big order from
www.capacitorworld.net
Sure can't beat the prices. The manufacturers were a mix of parts, many of the filters were Nichicon. Used them in a couple sets already, they seemed fine. The only weird one was the 10 uF@ 450V, they were a lot smaller than others I've seen, but all the rest looked pretty much identical to Mouser fare.
I used to order everything from Mark Oppat, but I gave up on him. My orders were getting lost and not shipped.