Price needs to be calculated in a way that is relatively cheap for what the product is worth and how the user will enjoy it. Price it competitively with smartphones and tablet, and you may have a bestseller. Price it too high and it won't sell. The nintendo 3ds struggled until it's price drop...
TAKE THE DEAL!!!!!!!!!!!!!!!! Facebook is great for a small startup to get funding. I love the idea of the pyra and want it ASAP, so the facebook deal is a great way to get it on the fast track to success.