I recently bought an LG LSM-100 Scanner Mouse.
The LSM-100 is useful to me because I have a large book which has been cleared and I can't use a standard flatbed scanner because the book is extremely heavy and, I fear, somewhat fragile - I'd rather not risk pages teraing/falling out owing to the stresses involved inusing a flatbed scanner. I don't have the motivation to build a DIY arrangement using a digital camera. The LSM-100 has one or two personality traits, but I find I can work with it to my satisfaction. Essentially, you pass the mouse over the page in a side-to-side and top-to-bottom motion to scan the page. I've found it helpful to use a quite stiff craft cutting board under each page to help support the mouse when it approaches the edge of a page where it might 'fall off' the edge.
The package includes OCR software and seems to work well for my purposes. I would recommend folks take a look at this device if you have similar requirements to me.
Roger