Those who like to read digitally have likely heard of Oyster, the monthly subscription service geared towards avid readers. At $9.99/month, getting the most out of Oyster is easy if you read one or more books monthly. If you don’t, you might have wondered why you’re subscribing — why not just buy books as needed? It’s a crossroads many have found themselves at, but you no longer have to leave Oyster if you’re not interested in subscribing. Today, Oyster is launching an eBook marketplace, where you can buy digital copies of books.