Etsy is a great online place to get it. Or if you have vivah (usually in the middle kiosk at the mall) they have great jewelry for brides that are good for sensitive skin. Charm jewelry also has table in front of the store that are on sale. They are usually simple but if it'll work then why not.
I ordered my bridesmaids jewellery from Etsy. You can always ask what metals are in them before ordering. Depending on your price point you can also check out some local jewelry stores. I bought my bracelet and a pair of earrings on sale at one, and didn't have to break the bank, plus I can re-wear them!