Pricing on Amazon is often dynamic.
I've seen the price on an item i'm watching fluctuate several times within hours.
Shipping is similar.
Needed to order a bunch of the same item for the office.
Free next day shipping so dropped 6 in the cart and next shipping day turned into 3 day.
Changed the quantity to 2 and next day was available again.
So I placed 3 separate orders of 2.
