Here's how you can purchase the Nexus 9 for $30 off
Best Buy still has a small number of tablets available for online ordering, and shipping is free. So you can order the Nexus 9 from the warmth of your home, and still take advantage of the discount.
If you live in Canada, or around the Canadian border, Best Buy will sell you the tablet with the same discount, inside its physical stores. Or, you can try the Future Shop. The latter also has a $30 discount on the HTC produced slabs, although it is no longer offering the deal online.
source: BestBuy, FutureShop via MobileSyrup