Check the auction site, search for men's plaid wool shirts or jackets. You can usually find some really nice stuff for under $25.
Don't go by the listed size on anything you find there, check the measurements because a lot wool clothes made a trip through the washer and drier and a large will often be closer to a medium.
I checked the measurement arm pit to arm pit, sleeve length and distance from the collar to the bottom hem of one of my shirts that is a little big on me. If I see one for sale I like with the same measurement I bid on it.
My last acquisition was a red and black plaid Melton jacket from the 50s that looked like new for $18.
I haunt the local thrift stores as well but wool items are few and far between in the south where I live.
A word of caution, I have heard the one should take any clothing bought off the auction site directly to the washer or dry cleaners as soon as you open the package. There is a slim chance the item came from a house with bedbugs.