As of right now, 37 states have either no state sales taxes at all (Alaska, Delaware, Montana, New Hampshire, and Oregon) or have complete or partial sales tax exemptions on the in-state retail sales of coins and precious metals bullion. That may soon change.
All ten of the most populous states and 17 of the 20 most populous have such exemptions, so that well over 80% of the nation’s residents have such an exemption where they live