I managed to score a copy of "Spinning Wheel Building and Restoration" on ebay recently. They usually sell for $40-60, but I bought it in a bundle with a bunch of other spinning how-tos for $30 total.
Also included in the bundle were two copies of "Warp and weft from Tibet: A guide to Tibetan rug weaving as taught by Edith B. King". I only need one, so I may be able to recoup some of the expenditure by listing it. Yaaas! (Now I just need to make the time to actually spin and weave.)