We did it--we just passed the 1,500 participants mark!! That brings us to the highest discount tier at 60% OFF.
Now that we've reached the highest discount tier, you can check out early from the
group buy page in your account--just look for the text right under the group buy form: "Ready to complete your group buy order? Check out here". This link will add everything in your group buy order form to your cart. You can still modify your cart contents, of course, including redeeming Orange Slices for an additional discount.
If you want to make an additional purchase later, you still can--just remember that September 12th is the final cutoff date. To make an additional purchase, head back to the group buy page in your account. That way you'll be able to add the group buy discount to your cart.