Two of my favorite Ross courses are Granville Golf Club east of Columbus in Granville, Ohio and Greenock Country Club in Lee, Mass. Granville is very close to the original with holes numbers 15, 16, and 17 being brand new and were part of a land swap with the subdivision that was recently added. The 18th hole their is one of my all-time favorites as it sits 125 to 150 feet above the fairway and offers a great view of the surrounding area. Greenock is a little 9-hole course (3,100 yards-ish) that is just a well-routed fun course to play. As far as I know, it is mostly-unchanged from its original design. Also, if you are in the area of Lee, Ma, I would recommend playing Cranwell resort for a good Stiles and Van Kleek course.
As for one of the previous responses, as of a recent phone call, the Orchards Golf Club in Mass. became private a year or two ago when Arnold Palmer Golf Mangmt took it over and is still private right now. Otherwise, I would love to play the course.
As was previously mentioned, the Balsams Grand Resort's Panorama course is a very good Ross course that offers a great twilight rante of two for the price of one greens fees that with a cart works out to be $45 per person. The only problem is that the course is about an hour shy of Canada in NH which puts it in the middle of nowhere.
Finally, the Sagamore Golf Club in Bolton Landing, NY is a very good Ross course that was supposedly restored with the original design documents in the late 80's. The course does offer daily fee golf; but, it is around $105 to 125 with no twilight rates.
I would not consider the last two courses muni's; but, at least with the Balsams, one can play it for reasonable rates.