Tell the seller you'll check with the tax board in NM and make sure he is listed with them, just to make sure they will get the money. I doubt that the seller is a listed merchant. I'm sure the state would love to hear of somebody collecting tax for them and not reporting it. Mail order (online stores) charge sales tax based on the state you are in, only if the seller has offices in your state, otherwise they are exempt. One of the big hobby suppliers I buy from started charging me tax and I found that they had opened a storage facility in my state, so they had to start charging sales tax.
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