That info & option is not visible on Kindle eInk version of the Kindle Store. At least not on firmware 5.8.11.
For Kindle eInk devices "built-in" Kindle Store view uses basically an older version of mobile version of Amazon website (since now even the mobile view of Kindle Store section has that option for adding Audible edition when buying Kindle edition/ ebook).
I've just checked and Kindle for Android app displays "Add Audible book to your purchase for just N $" checkbox, so if iOS version also has that then you can use your iPhone for buying ebook + audiobook combo.
It should be much faster and less irritating experience than trying to open "full"/desktop/computer version of Amazon website in Kindle device's experimental web browser (assuming that it can render the page properly).
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