Since the problem is in scanned images (and will then be in printed images also), talk first with the your scanners support people. There may be a kit for repairing this hardware problem. If your scanner is over 5 years old, you may want to consider a new scanner. Such consideration may become even more advisable if you are in a high usage situation. As with printers, stand-alone scanner prices are quite low.
As I'm sure you are aware, there is a beast called "all-in-one" where the printer has facilities for Copy, Scan and Print. Some have Fax also. All those uses have in common the need to have a flat bed usable by Copy, Scan and Fax if included. You should be able to get a good AIO for under $200.
Let us know how this turns out. Good luck and Happy Hunting!