Self-hosted PaaS platforms like Dokku, Flynn, Deis, etc give you Heroku-like deployment & management without the cost of something like Heroku. All three of these are built on Docker.

I've been running Dokku on DigitalOcean lately and it has been great (though I'm planning on eventually moving to Deis, now that DigitalOcean supports CoreOS).

https://github.com/progrium/dokku https://flynn.io http://deis.io