Oyster, a startup offering all-you-can-read ebook subscriptions, launched earlier this month as an invite-only service — but it's now available for all iPad and iPhone users, GigaOm reports. For $9.95 a month, subscribers receive unlimited access to a library of more than 100,000 book titles. While the company has deals with hundreds of smaller publishers, it only has a deal with one "big six" major publisher, HarperCollins, and are some gems in the mix: including Lord of the Rings, Shutter Island, and Water for Elephants. You can try the service out with a 30-day free trial by signing up on Oyster's website.