'Extended delivery"

I ordered a Nakery item and it was not on waitlist or extended delivery when ordered. The next day it said extended delivery but you can still order the item and it doesnt say anything about it not in stock. Why is this? Why would you continue to take orders for something you don’t have? It was on sale when I ordered it now back to full price, so if I order it at full price will it be delivered? This seems really unfair. My experience with items waitlisted etc…is not good most of the time you don’t get the item. I should be able to receive my item at the sale price if others are receiving by paying full price. Please explain. Thank you