Mountain lion install disk

i want to make a mountain lion installer disc on a 16gb flash drive for my new macbook air with 10.8.4 already on it (as anybody would), but when i try to option-click the buy button at the app store it says "we could not complete your purchase osx mountain lion is not compatible with this computer". As it's a new computer, this implies an issue--does anyone know what it might be? --BTW following david pogue's mountain lion bk instructions, p 796 here--he also mentions that apple used to sell installer disks with 'lion', but stopped--[wish they hadn't]. i'm off to buy a hard drive so i can archive the whole lot & do it that way--but honestly, apple folks!
thanks

The Mid 2013 MacBook Air includes a special 10.8.4 build that can't be downloaded from the Mac App Store, so this is the reason why you see a message telling you that Mountain Lion is not compatible with your MacBook Air.
This also means that you can't create a Mountain Lion install USB drive until Apple launches a new OS X update, like 10.8.5, so all Macs will be using the same version and you will be able to download OS X. Anyway, in a new Mac, it's possible that you can only get OS X Mountain Lion from OS X Recovery, preventing you from creating an install USB drive.
What you can do is to use Recovery Disk Assistant > http://support.apple.com/kb/HT4848 Note that this won't include the installer, so OS X will have to be downloaded from Internet

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