The first batch of Matrix Ctrlr is sold out. I will restock 10 more kits end of next week : you can preorder them by using the normal procedure in the paypal listing. I would ship them when ready.
Once this small run sold out, i will launch another batch, with price drop. Options should evolve too (extension, alternative firmware Eprom, assembly service). Waiting time should be around one month, corresponding to the necessary delay to restock all parts, panels, overlays and components.