Thanks for all the support! We're sorry to say that unfortunately, we have sold out of our initial build of the boards.
We do plan to release a few more boards in early May along with some updates on the first expansion card for the HiFive Unleashed, so please stay tuned! Make sure you signup for project updates (click home and the button is right below the main project image) and you'll be emailed when the boards are available again.
In the meantime, happy hacking and please let us know how you're doing at forums.sifive.com.