If you are only looking for a shawl cardigan, just check macys, nordstroms, etc. It is sweater season, so they aren't too tough to find.
http://www.ebay.com/itm/NWT-Polo-Ral...item3385af5f30
M&N and Ebbets made repros. You can usually find them for $200 or so when they turn up online, but they are fairly scarce.