That's the way, then you have a three week headstart. Also look into 1/4 inch rainbird irrigation tubing for replacing the blue air tubing when it starts to break down. Much cheaper to grab a roll of that then pay the price they want for replacement tubing. The rainbird product is much tougher also and will survive having to be cut out of the roots at the end of harvest.
And while you are putting in an order big enough to get free shipping, grab ten of the yellow silicones that fit into the autovalves. All it takes is having one drop and bounce out of sight while cleaning the valve to stop your grow. I made the mistake of cleaning the valve over an open sink drain and lost one down the drain. Could have been a big problem had I just been making a reservoir change, luckily it was at harvest and I had three weeks before I needed them again.