Showing ETA and back order in Item page
This customer www.suclo.co.nz offers large quantities of products. Some customers want a large amount of the same item and that amount is not available.
That is why its important for them to have 2 functionalities:
a. Back in stock email. Online users can leave their emails and they will automatically be notified when the item amount is back in stock
b. Showing an ETA date, so people can preorder it and know that the rest of the items will arrive at a later date.