My understanding is that they build to order. They have the capacity to build 1100 SP30s for August delivery, but they will only build the amount ordered. They won't build more than ordered and sell them from stock.
They have the capacity to build only 1000 SP30 for August delivery. The 100 extra was just in case there were people who won't pay in case this got filled up.
@Crypto_Cumbrian from what i know not all the details are set up. But the there isn't any additional cost except the installation fee and the monthly fee. Depending on what you choose (free shipping or one month of hosting for free) then you might pay for shipping. As for import duty well i'm not sure, but i think it will either be very low or non-existent.
Touch Labor i'm not sure if it's needed. The SP10 reboots itself when it's not mining for more than 5 minutes and there should be a staff 24/7 that can check the connectivity to the miner.
Warranty no idea.