Hi Cyrus-
Thanks for the interest! Kithub is the only company to sell complete kits - We’re incredibly lucky that they are willing to do so as they use their bulk buying discounts and take almost no commission so they are able to sell the kits at what is effectively below cost. Some of the most expensive parts are not kept in stock in large numbers so if there are several orders at once sometimes those can take a week or two to replace.
As the bGeigie Nano is a total open device you are of course welcome to source all the parts on your own as well, our understanding is that this tends to cost about $1000-1200 right now at full price for all the parts, independently shipped to a US location. If you are outside of the US some of the shipping costs can be more expensive.
Good luck, and thanks again!
-sean