Hi,
I have various experience with DWH, OLAP and BI projects. From your budget i understand is something not so big. Sure, if you have some technologies already in place we can go with them, but i'd suggest to consider Power BI. It has a built-in small etl engine in each report, so the data can be transformed easily and the data model can be stored in MS cloud service or locally as a workbook (similar to excel). And off course it's possible to develop any kind of dashboards and reports on top of it.
If you don't like approach with Power BI we can go with any other tech. MSSQL, MySQL, custom ETL with python etc. It's up to you.
Let me know if you're interested.
Regards,
Mykhail