Real-Time MES-LIMS Data Integration

I run a lab with 8 separate pieces of equipment, each writing its test results to a local PC in Excel format. I need a lightweight, always-on service that watches those Excel files, validates every new line of data, and streams the approved values over our LAN to one central server... (Budget: $30 - $250 USD, Jobs: API, C# Programming, C++ Programming, Data Integration, Excel, Microsoft, Python, Software Architecture)