Unfortunately, we do not have a sample size of frozen wheatgrass juice to ship. It costs almost as much to send 1 fl. oz. overnight as 100 fl. ozs. which makes it cost prohibitive.
What you will find is that the 100 fl. oz. package is actually a great sample size. It gives you sufficient juice to really try it properly. This allows you to make good observations and properly decide whether or not it is for you. For more information, see How Much Wheatgrass Juice Should I Drink.