Hi- I have gone through your provided brief very carefully,
I am a well expert in MS Office including in MS Excel, I have more than 20 years' experience in this (from Excel 95 to current version).
I have already done this type of work, this is not a big work for me, you can trust and assign this job to me without thinking twice.
I promise to finish as soon as possible and save your money unnecessarily spending.
Note:
I can do up to 100 to 150 files if any, within this budget, trust me NO extra cost.
I have my own excel script (developed by mySelf) I can easily do this work, If you have more then 150 files, please discuss with me for better and fastest solutions (through Freelancer.com).