LCCS offers a temporary data storage mainly for exchange of small files during a collaboration session.
The file size limit is 10Mb and it's not configurable.
There is no pricing for data storage because "we don't offer data storage" as a main feature of LCCS.
We have plans to enable the provided FileManager to store/retrieve data from an external service that you as the developer can implement and/or configure (a WebDAV repository, S3 or something similar). That way you can control how much storage you want to provide for your applications.