Boulder Bicycle is my go-to online shop for vintage chain. For a time they were offering bulk chain separately packaged (not factory packaging) for around $15 a chain - Sedisport narrow, for use on 5 or 6 speed FWs. They offer a similar chain currently for around $26.

Check out some of their stuff here: Chains

One thing for sure, buy NOS. No point in buying even a slightly-used chain or FW if they won't play well together.

Be vigilant and keep an eye on Ebay for the FWs; when it comes to Reginas they seem to be fetching all sorts of prices. Personally I'd not spend more than 70 bux shipped. Chainrings? Always been difficult to find in good shape and again prices vary but if you're looking for NOS or barely-used you'll have to bite the bullet and pay a bit. Consumables

DD