How to designate a region for regional shipping charges by weight with drupal commerce? My commerce shop needs different shipping charges by weight to different regions in the U.S.; the east coast, the mid-west, and the west-coast. 

Such that a 6oz package would have three different shipping charges depending on where it was going.

I would imagine this need three different weight-based rules for shipping, I am specifically wondering about how to implements the conditional statements for these. I would imagine one way to implement this would be a series or AND/OR statements in the conditional, but for a case like the US, thus means sometimes 20+ AND-OR conditions on a state by state basis.

Is there an easier way to designate a geographic region as a collection of states? Or is this the best and only way to implement this?
You can try out Commerce Shipping Postal Code Weight, which sounds like it might solve your problem.