I wonder if there is a cheaper option?
I don't think so. Even Tech sights are really a budget product with some shortcuts taken. The adjustments are not scientific. One click may be 1/2 MOA and the next may be 3/4MOA and then clicking back it may be 5/8MOA. Mine do hold zero well, just don't think you can keep a book of adjustments at yardages and reliably make the adjustments.