This will be a step by step guide on going from 0 to Heroku deployment for Reaction Commerce
If you don't have one already sign up for a Heroku account.
Install the Heroku Toolbelt based on your OS here and follow the heroku login instructions on the page.
Install a copy of reaction commerce.
git clone https://github.com/reactioncommerce/reaction.git git checkout trunk heroku create
Heroku create generates a random app name, so let's change it.
heroku apps:rename (desired-name) --app (current-name)
Now add a ROOT_URL environment variable
heroku config:set ROOT_URL=http://(desired-name).herokuapp.com
Now Add a Mongolab instance (they have a free tier for heroku)
heroku addons:create mongolab
Now we'll need to add the buildpack that'll let Meteor play nice with Heroku
heroku buildpacks:set https://github.com/swrdfish/meteor-buildpack-horse.git
git push heroku trunk
Wait... And Done :)