If we have a US-based SCA site and want to add a Canadian version of the same site, do we have to list our prices in Canadian dollars?

Not necessarily, but it depends on what you mean by "Canadian version". What's Canadian about it?

Basically, we’re trying to assess our options because we began using AvaTax but ran into some issues with our Canadian customers. We figure this is why many sites have a “separate site” for different countries, and were just curious as to what it would entail to make that happen. Alternatively, we may just need to find a way to update the

taxitem

field upon an address change in the frontend. Not sure if you have any resources that would help me out if we pursue that path?

I know we have some documentation on multi-lang and multi-curr but I am not sure it offers an assessment on options. I do believe that the recommended route is having a separate site -- this can help with SEO, for example. I myself can't really offer a lot of advice as I can really only approach this from a theoretical POV, sorry

Got it. Thanks, I appreciate the response!