You do understand that you are required to pay duty on them when you bring them back across the border.
Back in the day, my dad used to get autobody and auto upholstery work done in TJ. He was totally busted when he was driving his car back across the border and the US Customs agent smelled the fresh paint. His savings were wiped out in duty costs.
I’m not saying it may not be cheaper to buy them there- but be prepared to pay import duty. When they ask “anything to declare” they mean more than drugs and illegals.