I have a 1985? Univega Suntour that has a 47 chainring. I'd like to kick it up to around a 53.
I talked to my LBS and they mentioned it would be hard to find a chainring that would fit my bike.

What stores online offer older-styled Chainrings?

EDIT: Thanks for all the input. Urls mentioned: Peterwhitebicycles.com and Harris Cyclery. Both of which don't offer the chainring- which ended up being a Ofmega or SR 118 BCR chainring. Thanks for all the help!