Osbos, it is the income from the sale of the Guide Books and BNT Association memberships that keeps the trail open. The BNT Association is solely a voluntary organisation and the costs associated with keeping the trail going and the membership insured is great.
It is only here in the ACT that any assistance and support is given to the trail by the ACT Government with their understanding that the trail is significant. The senior coordinators of the trail work tirelessly meeting with the State Governments and the local Shires to improve the trail and not loose out to other interests.
I know that it is good to factor in every possible saving for touring in this country and hopefully without sounding glib ... long gone are the days when a simple bushman's holiday here, was considered a poor man's holiday.
I can relate to what you've requested, absolutely. I spent many years getting lost on the BNT when it was called the National Horse Trail before I knew that guide books even existed. It can be done without the books ... but not well. Once you purchase a guide book/s, it will save you money, heaps. The books give you all the contacts and can allow posting supplies ahead to coordinators who live close to or are on the trail.
The BNT Association now has a series of guide books called
Weekends on the Trail for those who don't have the time to commit to the bigger distances. These are slightly more affordable.
As Association members we have an undertaking not to post pages from the guide books to others or loan our books. That's not about penny-pinching, it is about keeping the trail open.
Good luck, hopefully you might find old guide books for sale but they're prized by those who've done the yards. A good place to enquire could be on the
Australian Bushwalking Forum. You would then need to add the amendments to the book/s to bring them upto date, consistent with the edition of the book/s that you find. The amendments are found in the
Download section on the BNT site. If you do find pre-loved books, consider spending $30 on BNT Membership for the personalized extras.
A fair price for Guide Book #10 Jenolan Caves to Yaouk 3rd Edition now, would be $50 or even higher, which is double it's original price. If anyone has one for sale, please let
me know.
Crossing the Lerida grasslands to the North of the Australian Capital Territory.

Warren.
"But on steep descending...Larson TT have bad effect on the mind of a rider" - MadRider from Suji, Korea 2001.
"Paved roads ... another fine example of wasteful government spending." - a bumper sticker.