Okay, so I found out that one of the BEST freshwater magazines in the world, Amazonas, is available online for free. Free! It was a German magazine, but they make it in English now.
You won't really find a lot of betta things, but it's great if you're into other fish. :)
Plus it's got pretty pictures. Just click "current issue."
AMAZONAS MAGAZINE | one of the world?s leading freshwater aquarium magazines
Also, as a side note- that thing on the website main page- origin of the flowerhorn? Except if that's from lake Malawi then I don't think it is. >_< Then again, we'll never know.