A new subscription service called Oyster is following the Netflix model by allowing readers to view an unlimited amount of eBooks for a monthly fee. Though initially, Oyster will only be available on iPhones and iPod Touch devices, the service offers an alternative to having to actually purchase eBooks from an online store. Currently, access to the app is by “invitation” only (you can request an invite on their site), but the service will cost about $10 month …