I've always tipped my movers, but all my jobs have been local and, quite honestly, I can't remember how much I've given them. I did a google search and read that the industry standard is 5%. If you use that as a guide, then you'be be talking in the neighborhood of $225. It seems to me that if you have them each $100 bill, they'd be happy with that, but if you want to split the difference, give them $120 each. I tend to think that's pretty generous.