The Lambdanodes are not officially sold yet. I do however have some prototypes available. The price is 20$ for the Kappa node (environment sensor) and 15$ for the Epsilon and Theta node. I even have a few Alpha nodes for a price of 25$. If you would also like the silicone housing for the Alpha node that is another 20$. Yes, it’s expensive for just a housing but they are very time consuming to make.
The sensor nodes work flawlessly but the Alpha-node code may still contain some bugs. Please contact me if you want some nodes for beta-testing. I do have code that runs on an Arduino as well if you do not need the Alpha node’s capabilities.
Lambda Nodes 