Saddlestitch - Is It Your Niche?
Saddlestitching could be the reliable and inexpensive binding method you have been looking for.
Producing booklets used to be a much tougher job for the employees at Northern Arizona University Creative Communications. They had to hand collate sheets, fold them on a Stahl folder, three-way trim them on another unit, and then use a Rosback 201 stitcher to finish them. The alternative was to outsource the work.