If you go to a store, you can purchase without paying tax. Technically, you may be obligated to pay a "use tax" to your home state when you pay income taxes. The law surrounding this is very confusing, though, and compliance is low. This is why there's a lot of controversy with respect to sales tax and online purchases (e.g. when you buy from an online store that has no physical presence in your state, they typically do not collect sales tax from you, but sometimes, and in some states, you are obligated to use tax, but hardly anyone understands how to report it or do it, and it's not really enforced or tracked).