I just ponied up $50. I had already purchased a Make America Great Again T-shirt and some bumper stickers.
I donated last night after getting the email. I think I was on the mailing list because I bought some campaign buttons from the Trump website a few weeks ago. Bought them for a visit to the Trump Tower terrace. When the guy at the front desk saw them, we got an escorted ride on the express elevator to the terrace. :-) everything was first class at the Trump property!