Actually, it’s not available just yet. The staff at Fantasy & Science Fiction Magazine didn’t quite get the Amazon subscription up and running before cancelling subscriptions purchased elsewhere.
Fictionwise sent out an email announcing the cancellation yesterday, but it was rather terse: We want to let you know that the publisher of “The Magazine of Fantasy and Science Fiction” is no longer offering this magazine through Fictionwise.com or eReader.com. We have refunded your account for the remaining issues on your subscription. We’re sorry for this inconvenience. We invite you to browse our magazine selection for other publications in this genre, such as “Analog Science Fiction & Fact.” F&SF confirmed the switch to Amazon on its forums.
I hope this doesn’t kill the magazine. The changeover was very poorly handled, and there’s a good chance that a lot of customers won’t bother to look for alternative sources.