There are 100 NOS Regina Oro freewheels for sale on german Ebay with a BuyNow price of 7 EUR each.
Shipping costs in Germany are 5,90 + 3,- for each additional freewheel (which is a bit high for my taste) but the seller states that he ships worldwide, so you have to ask for overseas shipping anyhow. I've bought already some items from this guy without any problems, otherwise no relation to seller.
http://cgi.ebay.de/
Dirk
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Dirk Feeken
Heidelberg
Germany