Ever since I can remember, the item page (before you add to cart) will show that an item is "Available for Pickup Today at X store" and then when you go to actually select a store when you add it to your cart, it says the item is either unavailable for pickup or takes 3-5 days for them to ship it. This seems to be due to the fact that the store only has 1-2 of an item rather than 3+.
Generally speaking, most people should only be looking for 1 of an item, so wouldnt it make sense to let the locator see stores that only have 1? I understand that there could be the very slim chance that the last item is a damged/open box clearance, but giving people the ability to at least get the "Store pickup could not be fulfilled" email is better than them going to another retailer because they were just told it was Unavailable because the store only had 2 of them.
I've included an screenshot of what I am referring to with the Item Page showing pickup today & the store selector showing only available for