Hi, you can download the demo now available for backtests and it's free:
https://token.gimmer.net/#demo
The platform will be free as well and they offer one free bot. There will be the option to customize your bot and then they'll charge GMR (Gimmer tokens) for that. Also by only holding tokens and not spending them, you will be able to use certain bots.
There is this video that shows how to use the demo, focus on the images 'cause the audio is in Portuguese:
https://www.youtube.com/watch?v=bk6ijUlTNJ0&t=299s
Or you can read this article that is in English:
How to Setup Your Bots in the Gimmer Demo DApp:
https://medium.com/@GimmerBot/how-to-setup-your-bots-in-the-gimmer-demo-dapp-36ebb3385b23
Read more about the bots here:
https://medium.com/@GimmerBot/meet-gimmers-advanced-algorithmic-bots-doing-all-the-cryptocurrency-trading-d9645cdf9399
Your question about prices is answered above, read the articles please, it will help you to understand a lot about the project and the bot prices. You'll be able to use the bots initially on Bitfinex, Poloniex and Bittrex, other exchanges will be announced soon.
Have all a great week =)