From the UM Press blog:
The University of Michigan Press announced today that it launched a new ebook rental program for more than 250 of its scholarly titles, allowing students or faculty to rent digital copies of the books at a discount for a month or six months. Costs will range from 40% of list price for a 30-day rental to 75% of list price for a 180-day rental.
To see a list of the titles currently available for rental, visit www.press.umich.edu/ebooks.
More information is available from the UM blog post.
hat tip to @cmairn and @paulkbiba