Mouser for electrolytics. Great selection, good prices, fast delivery.
Use Nichicon and Panasonic 105 degree centigrade rated 'lytics. They come tall and narrow, great for fitting inside metal canned multi-section 'lytics. They come in axial and radial leads. The Mouser search engine takes a while to get used to, but it is the best.
Tubular Caps? Just Radios.