I've done that for several games and Amazon still haven't matched Steam's prices 24+ hours later.
Maybe they need a certain number of reports before they act?
Maybe they are swamped and by the time they check the Steam deal is over?
Or maybe they just don't take any notice?
Total War Battles: SHOGUN
Steam 75% off $1.24
Amazon 0% off $7.99
No price match from Amazon?
Edit: The forum is screwing with the second link. Here it is - www.amazon.com/dp/B009EAOGPW