The ATC came out with a lot of new maps this year. So most used maps you buy can be up to 10 years old. I used the old ones and had quite a bit of trouble on my blue blazes because the maps were so outdated. Just something to consider.
I would part with mine, but they have a lot of sentimental value. The lamination is worn off in some areas, and I've marked a lot of short cuts and stuff on them. If you do decide to do some serious blue blazing tohugh let me know. I can easily cut off a couple hundred miles from a thru hike, and can give excellent directions.