I'm in the same boat (no pun intended). My life line project is on hold for now (money) but I have an in query in at D&R Marine about stanchions for the Oday 22, I'll let you know what Rudy says when he gets back to me.
I've seen stanchions on eBay for about $50 a piece, normally the base is sold separately, depends on the stanchion I guess. Most marine retailers sell them but they are pricey, $75 to $90 a piece, add include a base at $40 x4 it adds up.
As an aside, do you plan on using bare or coated wire? I've heard coated wire is not a good idea due to moisture being trapped against the wire causing corrosion.