There's no simple answer to the question in the title, of course, because services vary widely and many companies don't post pricing information publicly. But reading and looking for a rough rule of thumb, it looks like about $2-$3 per user per month at the low end. Assuming 100 users, that's between $200 - $300 per month. But prices mostly go up from there, and I'm sure the companies hiding their prices aren't offering discounts.
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