Prestashop 1.4.4.1 stock level export module

We are using Prestashop 1.4.4.1 and will hopefully be moving to 1.5 soon after it is released.

We would like a module to view stock levels of our products. We would like advice on whether such a module exists already, or if not, if you would be able to develop it for us.

Ideally, at the most basic level, we would be able to enter a date, and would be able to export to CSV the stock level at midnight on that particular date for all our items in stock.

Next stage of development would be to be able to select a date range, and export a CSV of the stock levels of each item on each of the days in the range. We could then use Excel to graph the movement of stock for each product over the selected date range. (Even better if we also visualise this in Prestashop without having to export to CSV, but would also like to have the CSV export option.)

Please let us know your hourly rate and how many hours you think it might take, when you could start on it, and if you have any previous Prestashop coding experience.