That looks like their tax filing product for ecommerce. The prices look pretty good, actually, at least compared to other others. A single filing seems to be about the same price as the others, but they have good discounts if you are filing in a lot of states which looks like Avalara might be a winner if you are dealing with many states.

I don't see any pricing for their services for their services for determining how much tax you need to collect for a given transaction.