I am getting the amount of interest in 20% udps for the 420a (total shipped under $100 most likely closer to $75 depending on machining costs). These would be professionally CNC machined at a large shop from 6061 aluminum plate. Before I take the stock and drawings to the shop, I need to have at least 20 people interested in one. Also, I will donate $2 from everyone that buys one here to support the site.