Yes, both Microsoft Power BI and Box offer a Free Trial.
Microsoft Power BI is designed for Large Enterprises, Medium Business and Small Business.
Box is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Microsoft Power BI Starts at $4,995/Month whereas for Box Starts at $5/User/Month when Billed Yearly.
Some top alternatives to Microsoft Power BI includes Google Drive, Tableau, IBM Cognos Analytics, Dundas BI, SAS Business Intelligence, Clear Analytics, SAP BusinessObjects BI, ibi Analytics Platform, Narrative BI and Microsoft Power BI Desktop.
Some top alternatives to Box includes CollaborateCloud, Microsoft SharePoint, Dropbox Business, FileCloud, ownCloud, Microsoft OneDrive for Business, Dropbox Professional, Citrix Content Collaboration, Genialcloud Facsys and Box Skills.