Ask HN: Netflix for audiobooks?

I own only a few movies since there are only a handful I'm even interested in seeing again. I usually watch movies and TV shows (once!) on various streaming services, including iTunes, Netflix, and Hulu.

Where are similarly priced streaming services for audio books? Here are the closest ones I've found after a brief search, which use the old 'mail me a disc' model, along with their comparatively astronomical prices:

http://www.simplyaudiobooks.com/rentals ($18/month)

http://www.booksfree.com/available_plans.shtml ($24/month)

Audible.com and Audiobooks.com are selling books for $15/month (or at least that's how Audible markets their 'credit' system). I'm definitely going to check out what's available at the local library!