Mary has a lot of photo negatives that she wants to scan herself. Leo recommends letting ScanCafe do it, because they'll also clean the negatives before scanning.
Epson makes a scanner, the Epson Perfection V500, which has a negative attachment. It's $150. There are plenty of others like it, too. Nikon makes the best slide/negative scanners, though. Then once she scans them, she can use Photoshop Elements for $79.
Truckee from the chatroom says he prefers the Wolverine Scanner.