Here are a few . . .
MARGIN OF VICTORY
WHAT WILL THE FIRST QUARTER MILE BE? UNDER/OVER 22.8
HORSE TO BE LEADING AT THE QUARTER POLE
HOW LONG WILL IT TAKE TO SING THE NATIONAL ANTHEM
HOW MANY TWEETS WILL PRESIDENT TRUMP HAVE
WILL A KARDASHIAN ATTEND THE DERBY
Looks like fun, I like the jockey prop in particular. Here is the link to the site:
mybookie.ag