Use Magento Out-Of-Box tax
OOB tax setup for testing:
(Brian, update here as you test this out, this is just from some quick research on the M2 out of box feature)
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Stores > Tax Zones and Rates : setup a tax zone e.g. CA or WA, wildcard / * for zip, tax rate e.g. 8.25%
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Create a Tax Rule : e.g. Local Test Tax Rule, Taxable Goods
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Assign Tax Class to Products in Catalog / Products set to Taxable Good (I think this is already set on our DB, or we could set some local for testing)
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We may need to disable Avalara in the config / and or disable the entire module for this testing / TBD