At present time there are 2,500 of Marvel’s back issues available online, with 250 of them will be able to read for free for a limited period of time.
The rest of them will only be available for paying subscribers. The monthly fee is $10, or $5 if the user decides to pay for one full year ($60 in total).
On the downside, subscribers will have to stick to reading the issues online. The content can’t be downloaded, but only viewed in a web browser window in various ways, such as page by page or frame by frame. Also, new issues will only become available only line 6 months after having appeared in print.
Marvel’s Digital Comics Unlimited service is available here.