People are working on cheaper arms and we should soon have ones for under $10K. Ex: Pieter Abbeel from UC Berkeley https://news.berkeley.edu/2019/04/09/meet-blue-the-low-cost-...
I remember him mentioning the project in his robotics class, found it: https://youtu.be/xWPViQ6LI-Q?t=4075 he claims it will be around $5,000
Maybe of interest