If you do not want that calculation made over $150.00 you would need to customize the code ...
You can change the error message by searching for it in the language files via the Tools ... Developers Tool Kit ...
/includes/languages/english/modules/shipping/zones.php
Line #27 : define('MODULE_SHIPPING_ZONES_UNDEFINED_RATE', 'The shipping rate cannot be determined at this time');
NOTE: while this will prevent the completion of the order ... when you manually complete the order over the phone, the customer's shopping cart will still have all of the products still in it ...
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