Where can I find a green wool pea coat?

If you are talking about a US Navy "Aviation" Green Pea Coat, probably a near-by Military Surplus Store. Or for that matter, if you know someone in the US Navy, ask them to pick one up for you at a uniform store.

Here's one in dark green from Victoria's Secret:

Victoria's Secret - Wool peacoat (http://www2.victoriassecret.com/commerce/application/prodDisplay/?namespace=productDisplay&origin=onlineProductDisplay.jsp&event=display&prnbr=3G-215157&page=1&cgname=OSCLOOUTZZZ&rfnbr=3134)

They have tons more coats, but not all are in green:

Victoria's Secret - Coats (http://www2.victoriassecret.com/collection/index.cfm?&rfnbr=3134&cgname=OSCLOOUTZZZ&cgnbr=OSCLOOUTZZZ&page=all)