Hello.. Im looking to buy a Phone/Fax for the office. We will have 20-30 fax only in a month. Sending and receiving. So, not that much usage. I was looking at HP® 640 Inkjet Plain-Paper Fax . Just wanted to know, if its good to those Inkjet Fax , because Im not sure, what will be the monthly cost for using such inkjet faxes. So, let me know , if its good to go with it. Also, let me know, if you have any other recommendation. My budget is 100$ only.