It looks like you could use code like this for the shipping select:
<?php
if ($eCart1->TotalColumn("TotalPrice") > 100) {
?>
<option value="CA|0">In Canada - Free</option>
<option value="US|0">To the U.S. - Free</option>
<?php } else {
?>
<option value="CA|10">In Canada = $10</option>
<option value="US|15">To the U.S. = $15</option>
<?php
}
?>