employee supplied equipment

I just had an employee ask about bringing in a new LCD monitor and adding it to her work machine because the standard monitor took up too much work area on her desk. We are a non-profit most of our desk were not made for computers.

How do you handle this type of request. Being a one person IT department with more than 50 users, I really don’t want to get into this. I could see a support nightmare waiting for me if this should happen.

Any comments or suggestions would be helpful