[shilala]

If you're not in a huge hurry, you can use 1/2 live sand and 1/2 whatever sand and give it a couple weeks. You don't even need 1/2 live sand, just a good amount to seed the tank.
I guess my point is that the base needs to be deep and thick. If the cost of the sand causes you to order less than the optimal amount, that's okay, but add enough other sand to get a good base.
Most folks skrimp on base material and it's the heart of a system. The deeper the base the more biological action and the healthier the tank. It's huge.