I think it's an excellent idea. But let us not forget the true origins of May Day in the Haymarket Martyrs, five anarchists who were murdered by the United States government after being framed for a crime they did not commit as they were demonstrating for worker's rights. We should be showing solidarity with our fellow workers, no matter where they happen to come from, instead of mindlessly feeding the system which oppresses us all. Shopping isn't going to help anybody, except of course for the capitalists who are profiting off the backs of the immigrant workers who manufactured the products you're buying.