You can try JT Sprockets. High quality and not very expensive.
For the chain you can check Regina, RK, D.I.D
I can see by my watch, without taking my hand from the left grip of the cycle, that it is eight-thirty in the morning. The wind, even at sixty miles an hour, is warm and humid. When it's this hot and muggy at eight-thirty, I'm wondering what it's going to be like in the afternoon. - Robert M. Pirsig