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My SaaS has only "Contact Sales" pricing right now because I currently don't have the infrastructure set up to sell to you in any other way. If the SaaS companies are young, they may be in the same situation. You could get a good deal by clicking the button.

Generally, the less you charge, the more infrastructure is involved in collecting payment - metered SaaS companies can charge you in increments of a few dollars but are backed by complex billing software, while enterprise sales is an invoice from quickbooks (I'm exaggerating a little bit about the level of automation here, but it's close to this).

Personally, the price for my "contact sales" product is a lot less than a typical "enterprise sales" product, with the price range being $10-50k. Some other young SaaS companies I have heard of are lower than that. Conversely, established companies with a "contact sales" button tend to start at $50k/year and go up from there to millions.

If you take control of the process during the call, and tell them "no" if they give you BS, you can probably get a price.