I flipped books from 99-01. Bought in person at library, garage, and estate sales. Sold on ebay. I did pretty good, then got too busy. Average buy was .25-1.00. Average sale was 10.00. I always had to get up at 4:00 or 5:00 on weekends to be first in line somewhere. You have to be able to find unusual books in a hurry to make money at it.
Mike