I bought mine on Amazon, nine days delivery. If you're that close to harvest though when you leave, you could over-water, dim your lights (if possible), and/or change your light period to 6/18 as to keep some light on so humidity doesn't get carried away while at the same time ensuring your medium doesn't remain completely wet in a long dark period.Thank you, that is the only system I have found that is like that. I am going to get one once I find the right vendor!
Plants will die off, but you can consider this period semi-drying time.
I've had to figure it out a few times as I was running a 21-day three cycle perpetual
All the above, of course, only recommended if you can't get the drip systems in time.
-spek