PHP Mysql Excel Script needed

Hi Everyone I need someone who can help me with a PHP, Mysql and Excel script. What I Need: ----------- I have a website with 50+ MySQL databases. All databases have different fields and tables. I need a script where my visitors can upload an Excel file with many id numbers. These id numbers must then be searched against all the databases. I just need certain fields to be returned. The results must be returned to an Excel file, which my visitors can download. Budget: ------ I have a budget between $50 and $100 for the script.