Here’s a cool website for readers. lists local and community book sales by state. The site is fairly new but they are adding several hundred sales a day, a rep for the site told me. Libraries and non-profits can for free.
Search for sales by state for sales near you. When I searched for sales across California the site , including a promising one . (Titles are $.25 to $1).There were and . See .
Some sales also list how many books will be for sale.
If you set up an account, you can get emails about upcoming sales that fall a zip code radius that you set, i.e., 10 miles within the zip code 91302. You can also create a calender of upcoming sales and get email notifications about the sales you are interested in. Neat!