If you are looking for cheap caps, go here..

Alibaba Manufacturer Directory - Suppliers, Manufacturers, Exporters & Importers

And here...

All Electronics | Electronic and Electro-Mechanical Parts and Supplies at Discount Prices

And here...

CapacitorWorld | Electrolytic Capacitors & Film Capacitors

You will have to dig to find the values / voltage you want.

.......GC