I use the developer tools part of the Amazon services and that's been free so far.
I use that for Alexa and Homeseer integration. Homeseer provide 2 skills for Alexa and the more capable version is only available for US (or is it North American) users. Someone came up with a way for UK users to get the full capability. I did also toy with trying to use it for the rtsp cameras and Alexa (there are some ideas online) but abandoned that one.
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sj