eBlast

SIBA eblasts are a one-time promotion sent to all SIBA bookstores and booksellers. There are 2 spots available per day, 

Check to see if your target date is available: SIBA Eblast Reservations Calendar 

Specs and Deadlines:

Art size: 1600x1600
Formats: jpg, gif, png. Animated gifs are allowed and tend to have the best performance.
File size: Must not exceed 5MB. Smaller is always better
Other requirements: URL links and eblast subject lines must be provided by the client. Pre-header lines are optional. Click-through destinations to retail pages are discouraged.
Deadlines: 5 days before run date. SIBA blasts run as scheduled
Send files to: nicki@sibaweb.com
Target Audience: Booksellers
Circulation: ~750 Bookstores and Individual Booksellers
Average Open Rate: 48%
Average Click Through Rate: 4-6%
Notes: Industry-targeted advertising should avoid click-through destinations to retail websites or to pages that offer retail purchases from indie store competitors.