You could go to the Modules ... Shipping ... and turn on the Free Shipping Options freeoptions shipping module and set it to Total >= 100.00 ...
Then build a Zone for who you consider to be the US ... and add that to this module ...
When Orders are $100 or more, the Free Shipping Option will show for everyone you have defined in the Zone for the US ...
The other methods will also show for those in a hurry and want a different shipping method ...
Linda McGrath
If you have to think ... you haven't been zenned ...
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