Until some completely new, revolutionary method is discovered (like mint coins back in the day), the only "new" methods are loopholes and workarounds in the currently known method of buying either GCs or reload packs...or loading directly onto pre-paid cards. The only news are local variations of those methods, and those can be easily discovered with some trial and error.
Any major new methods would either get shut down immediately if they're too lucrative due to an unintended loophole, or otherwise would be reported all over the blogs.