[archemike_]

what's going on is an item that's FBA(fulfilled by amazon sitting at an amazon facility) is at a facility that's not near you, so it's physically further and although it says prime they won't expedite in a day since it's maybe east coast placed and you're in California so they don't do same day because of this unless the item standalone is over 35. This is sort of against the spend 35 and get free shipping but seems to be the apparent modus operandi as of somewhat recent.

e.g. 25 dollar item and 15 dollar item might both be two days and would have to pay for one or same day even though total is 40 since one is FBA'd from a further location, so the same day can be misleading happens to be sitting at a facility that the seller shipped to, what happens after shipping into fba and how they disperse inventory if at all for lower latency in shipping I don't know but I am seeing more and more where they split orders to not pay same day even if total is over the same day rate. Hope this sheds a bit of light.