You can pre-order a roboRIO now from AndyMark (but it won't ship until December).
http://www.andymark.com/product-p/am-3000pre.htm
If you don't want to order yet, you can fill out a form indicating how many you want to buy, so to help gauge interest.
https://docs.google.com/forms/d/1eiZ...?usp=send_form