We have a few spare wireless neurons available to sell. However, you can only have one neuron wirelessly paired to your keyboard; the second one will only work wired.
This is because the neuron needs to be paired with the sides in order to communicate. This is not needed for wired mode. You can pair a neuron to the sides by flashing the firmware, but it's not convenient if you have to do it every time you want to use a different neuron.
If you still want a second neuron (for the office or as a spare), the price is 69 USD plus 20 USD in shipping and handling.
Just email us to support@dygma.com with an up-to-date shipping address and phone number. We'll create the order and email you a link to complete the purchase on our shop.