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RepArchive has it's own shipping calculator that combines all the different agent shipping calculators on a single page. You could say it's the ultimate shipping calculator.
It pulls the data live from the agents, so it's just like opening them all in parallel, entering your information for each and comparing the results yourself.
It also makes the comparisons easier because you have different filter options, for instance you can filter out delivery services that don't allow branded items. Sorting by price or time allows you to decide what's important.
The shipping calculator is available here: https://reparchive.com/shipping-calculator-comparison/