If you want 3 or more languages, then contact us (at https://about.sourcegraph.com/pricing) and we can give you a package discount. Overall, if pricing is a concern, I'd love to learn more. I'll email you.
It may be useful to consider a baseline two-language deal, as Javascript + one server side language covers a huge amount of use cases.
That said, you cover 2 out of 3 of the following scenarios pretty well with the existing model, I just happen to fall into the third, which is probably the smallest sector for you guys anyway:
1 - Small startups, probably standardized on one or two languages, 8-10 people 2 - Larger orgs (200+) where the cost is negligible compared to revenue. 3 - Medium-sized, microservice/squad based orgs, with heterogenous language support but focused within teams.