Hi, I'm new here, so thought I'd start with something helpful. I've been compiling a spreadsheet of book advertising sites. Included are their traffic estimates based on trafficestimate.com (not their own words, which I've found to be VERY unreliable), and Facebook like counts.
Most of them (at the top), have a free option. The first book in my fantasy series, I Bring the Fire, is free, but some of them accept bargain books as well...I tried to go through and label those as I came across them, but wasn't that motivated.
Here is the link: https://docs.google.com/spreadsheet/ccc?key=0AkOyQ5SflEaodEM0VGlpRm5rU2ppTWpGQkFpUkxrY1E&usp=sharing
Have fun!
...Oh, and if you can think of any more, please let me know!
Most of them (at the top), have a free option. The first book in my fantasy series, I Bring the Fire, is free, but some of them accept bargain books as well...I tried to go through and label those as I came across them, but wasn't that motivated.

Here is the link: https://docs.google.com/spreadsheet/ccc?key=0AkOyQ5SflEaodEM0VGlpRm5rU2ppTWpGQkFpUkxrY1E&usp=sharing
Have fun!
...Oh, and if you can think of any more, please let me know!