Once US AIR stopped offering points for Amazon the only way to go was ½ a point via Hawaiian. Now they are up to 1 full point per dollar spent.
Now remember you can transfer 1 Hawaiian point to
2 (edit: now 1.5) Hilton points. So, you are in effect getting 2 Hilton points per dollar spent at Amazon on top of the points card you use to buy whatever you buy. Not a bad deal! – René