Accessing Advanced Custom Fields with Repeater using jQuery instead of PHP

Assuming you registered or enqueued your jQuery script using wp_enqueue_scripts and assigned it a proper handle, this function will allow you access to the postage_prices fields in jQuery via a variable postagePricesArray.prices. You need to replace %YOUR_SCRIPT_HANDLE% with your jQuery script’s actual handle or this variable may not become accessible.

function localize_postage_prices() {
  global $post;
  $id = $post->ID;

  if(have_rows('postage_prices', $id)) {

    $postage_prices_array = array();

    foreach(get_field('postage_prices', $id) as $price) {
      $postage_prices_array[] = array(
        'order_qty' => $price['order_qty'],
        'strips_rp' => $price['strips_rp'],
        'strips_ep' => $price['strips_ep'],
        'roll_rp' => $price['roll_rp'],
        'roll_ep' => $price['roll_ep']
      );
    }

    //
    // You need to replace %YOUR_SCRIPT_HANDLE% with your script's actual handle!
    //
    wp_localize_script('%YOUR_SCRIPT_HANDLE%', 'postagePricesArray', array(
      'prices' => $postage_prices_array
    ));
  }
}
add_action('wp_enqueue_scripts', 'localize_postage_prices');

Then in your jQuery file (which is enqueued and has a handle of %YOUR_SCRIPT_HANDLE%) you can access the array:

$(function() {

  console.log(postagePricesArray.prices);

});