Select DataBase tool+set-up assistance+Excel VBA retrieve data function

We have a table of financial data hosting time series of stock prices. The table is currently in an Excel sheet the size of which (20Mo) makes it difficult to manipulate. Task1- Select a relevant data base tool to host this table considering the following : - Free / open source tool, - That can be easily interrogated from Excel - That could also be used later-on to power a web based tool - Reasonnably user friendly Deliverable : a one page doc describing the tool and justifying it's appropriateness in light of the above requirements ; Task 2- Provide help to set up the database and include the table in it. Deliverable : Live help + one page user guide Task 3- Build a UDF VBA Excel function to retrieve data from the DB into excel. Excel function would be : GetPrices(StockCode ; startdate ;enddate) The budget for this is 80$ broken down into 3 milestones : Task 1 : 20$ Task 2 : 20$ Task 3 : 40$