How much Amazon hosting costs for a cloud Galaxy instance? Is it totally free? Are there any hosting alternatives? Does anybody tried to develop a cloud Galaxy instance and hosts it there?
The costs will depend on how much compute and storage you need. The prices are listed on the AWS website, so you can decide on what you want. I used cloudman to setup a multinode Galaxy cluster on AWS this summer for a training session at GCC2016 and was very impressed by how easy it was. Adding more nodes was trivial, the only thing that takes considerable time is increasing disk space, so don't plan to change that on demand.
For real advise on this, I would recommend either posting on the Galaxy biostar site or the galaxy-dev list, where there are a few people who likely host AWS instances.
look at the Simple Monthly Calculator for costs
https://calculator.s3.amazonaws.com/index.html
of course you would still need some machine spec - it does depend on what performance you need. That being said (and I my opinion) AWS is expensive if one needs a "permanent" host. The value of AWS comes from being able to vary the compute capacity to the needs. If you need 100 CPUs for a week it is great, if you need 100 CPUs for a year you may be better off with a different solution.
I didn't have to pay anything, since I could use the Galaxy training account :) That's why I suggested asking on either the Galaxy biostar site or the galaxy-dev list, since that's where you'll find people with normal AWS instances (my particular settings would have been overkill for you anyway, since I needed a ~10 node cluster for a couple hours, since all of the course attendees were going to be doing multithreaded jobs simultaneously),
Use of this site constitutes acceptance of our User Agreement and Privacy Policy.
version 2.3.6
Galaxy has its own user support running Biostar: https://biostar.usegalaxy.org/
The question is better suited there.