Tons of them at eBay, used and NOS, you will just need to find the correct threading and spindle size. Threading comes in JIS, French, Swiss, Italian, English (ISO). The cups and lock rings come in steel and aluminum. You also have a chice of sealed or loose bearing types. Best to go with sealed, of course, if you are looking for long term realiability and minimal maintenance. Don't bother with Titanium for these parts as they are just expensive weight weenie bling that might crack on you if you really work them hard.

Chombi