It sounds like Avalara costs $50 per year for small businesses, but scales up for larger companies. So compliance is trivial if it truly works.
Disclaimer: I work at TaxJar, just curious to hear your feedback. Thanks!
I'd also say I have a bias, as I've also used avalara a couple times before and found it to be quite a bit superior in making it seem quite a bit more effortless -- taxation is so byzantine I don't have any expectation that I could understand it, so I want to trust that the provider i use is very confident they do.
not sure if that helps a lot, but it was also a few months ago ;)