What's an average cost for lower arm control placement

Owner, $ 426.79, including a new replacement control arm, Labor for installation, & alignment & Sales Tax included, & about $100.00 less for a good used control arm, installed, including alignment & Sales Tax.

It cost me $149.99 for the whole assembly. at Napa. This inluded the lower control arm, ball joint, and bushings. I would just pay the extra $$. Your bushings will likely be worn and balljoint will need a replacement anyway. Plus its a super quick replacement.