[pas]

It needs disk space mostly, and you can run it with 2G RAM, so that's 20 USD/month on a VPS with SSDs with 40G space.

If that's still not cheap enough, then you can of course use it on a non-SSD VPS, configure it to use fewer Ruby worker processes and so on.

The only problem I (we) have with GitLab, is that it doesn't cache git trees, so it always fires off a git process to read the repository. (At least when this came up they wasn't open to caching it in Redis. Maybe this changed, or maybe it's available in their Enterprise offering...)