This is a community forum that’s gathered around a research project. A lot of the interesting questions here cannot be reduced down to a one word answer. Many people are involved in working on different projects and business activities. Some of those activities are discussed here, and some additional information is available on other sites that you can find by following links here. For other things, you would need to talk to the people who are directly involved. It’s possible someone is selling kits or may be selling them soon, but I haven’t heard about it.
The overall situation here is very different from a retail store. Building a food computer is a time intensive project that will require a lot of reading, troubleshooting, and navigating of unclear, fluid situations. If you don’t have time for such things, my advice is to check back in six months or a year. By then, perhaps a more retail-like option will be available. For now, if you read the threads I mentioned, you will find many resources to hep with ordering enclosure parts, circuit board assemblies, and other necessary parts.