Order Number From Nirvana?

Hi, I'm planning to send Nirvana an envelope of money to cover the cost of the 10 seed package for Early Bud. I was reading their payment information and it says: Please don't forget to include your Nirvana ORDER number!

Where can I get this Order Number?

EDIT: Sorry I didn't see. I have gotten my order number now. Please delete this thread

First off, if i were you id take that money and buy a visa gift card so your order gets to you faster. If you use a visa gift card then you dont have to give them your order number. And you get that order number by when you order..youve got to go through the whole process and at the end it gives you the order number and you send it with your cash, but i highly recomend you buy a visa gift card and use that