Yes!!! I’m not crazy… Power BI for FREE if you sign up today…
Link to sign up: http://powerbi.com/dashboards/pricing/
Here it is the official Power BI Pricing provided by Microsoft at the Power BI Preview Pricing page:
But seems that you need to hurry up!!!
Investigating a little bit more around the vast web, I unfortunately found this:
“…changes coming to Power BI licensing.”
and when zooming the page you will find this:
“* Prices valid starting 02/09/2015”