It's not really that expensive. GitHub Enterprise is like $21/month/user while GitLab Ultimate was $100/month/user the last time GitLab published prices. These days GitLab Ultimate is "contact us for pricing" while the cheaper GitLab Premium is $29/month/user.

I guess Bitbucket is cheaper but you'll lose the savings in your employees bitching about Bitbucket to each other on Slack.

When’s the last time you looked at or used Bitbucket?