Donald Trump’s online campaign shop is joining the Black Friday madness. The president-elect’s campaign is cashing in on the busy shopping day by offering 30 percent off his “Make America Great Again” gear, according to an email blast sent Friday. But to score a bargain on The Donald’s retail goodies — including caps, foam fingers and buttons — buyers are required to enter their employer and occupation on the shop’s website. A Trump spokeswoman said the information would be used for future fundraising. “That information is required for all political fundraising,” said spokeswoman Hope Hicks. To tap into the sale,...