Fictionwise is the best place to subscribe to those magazines - I've only been subscribing to Analog there since 2005 but I can still download all my back issues. (This is very good for me because I read them in spurts). Plus they offer F&SF which you can't get from the Kindle store (not quite as good a deal right now because it's categorized as Fantasy- but it's available).
I also prefer the lump sum payment system Fictionwise uses.
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