I wouldnt buy crap. I didnt during training and waited until my first job that had an educational allowance so high I bought a full library in a single day....
You finish previewing/grossing, grab dinner and head back to your resident quarters, read 50-100 pages a night, maybe 200 on the weekend and read both in under 6 months. There is no reason to have books at home FFS. You are sitting on your couch with choice of Capt Morgan/Coke, Paris Hilton's X-rated movie, reruns of South Park, your X-box360, your roomate's Wii and some 20lb text....that is a joke. Even if you could read undistracted, you wont retain as well if you were in a quiet cubicle in the residents room.
Plus you can look like a total gunner to the attendings. You will be that guy drinking Starbucks coffee at 9pm on a Wednesday reading Rosai's chapter on salivary gland tumors..how pimp is that?
This whole buy a microscope and preview at home or read at home thing is stupid IMO. If you are reading for boards, you can do that in 6mos before the test date with ease. If you are reading to learn pathology, actually seeing tons of cases is FAR superior.