Location really does not matter IF they are listing it as a Prime In Stock item. I unfortunately have purchased many thousands of dollars worth of goods through thousands of orders with Amazon, I say unfortunately because I hate thinking of all the money I spent.
Sometimes you will see a disclaimer on a Prime item saying it may take X number of days extra if they expect a delay (which really doesn't make a lot of sense).
I have selected a particular seller just like I did with this order and Amazon changed the seller I was buying from later on. Whether that was intentionally or automatically done was not clear. There customer service sometimes is of no help but that did happen a few times with me.
What is odd is that shipping is listed as 2 days but it's showing as 4-5 business days for delivery. I could call them and get that corrected but it's likely that they may change the seller I'm using to accommodate that time frame.
I think the problem is if you click to choose which seller you want and click on OCD Tronic, it list it as a Prime item but says it is out of stock and backordered (still) and will be in stock the 29th.
Like I said, I'm fine with the order as is but OCD Tronic should be aware of this, I would want to be.