We are looking for a way to offer three flat rate shipping options to our customers. One rate for the US, one rate for Canada and Mexico, and one rate
for the rest of the world. With the USPS flat rate boxes we can ship things for $8, $23, and $37 respectively. We are selling clothing, so I am less concerned with the weight of the items, if someone buys over 25lbs of clothing from us, I can pay for the extra shipping. I am looking to see if there is a way to set up
three flat rates based on country or postal codes with the existing flat rate shipping module, or if I need to have a newer shipping module installed.
I am new to all this and would appreciate any advice.