San Diego and Imperial Counties'
Serra Digital Download Library appears to have 800 titles:
Fiction - 499
Non-Fiction - 301
Biography & Autobiography - 66
Business & Careers - 58
Historical Fiction - 51
History - 27
Literature - 183
Mystery & Thriller - 235
Romance - 70
Young Adult - 139
These titles appear to be available to patrons of 9 public libraries (including municipal and county libraries with multiple branches). Two of the libraries apparently offer additional eBook titles to their patrons.
Based on my experience, popular titles have waiting lists several months long. An e-mail is sent when one's turn comes up, and the title is held for 72 hours.