Free Shipping for cheapest option only

Is there a way to create a coupon that allows free shipping but for the cheapest option only. Currently I allow a few shipping options and I want to create a coupon for free shipping. But I only want the customer to be able to use the cheapest option.

Thanks
Corey

I wanna know as well. Did you find the answer?

Judging from the titles of the posts listed below in the "Similar Threads" section I'm guessing one of those probably contains an answer.

ryguylivinlife - I never could find the answer. I ended up only providing the cheapest shipping option, when I was running the free shipping promotion. It;s not the way I would like to do it, but I could never figure it out.

DrByte - The "Similar Threads" below do not seem to answer my question. I did a lot of searching on here before I asked the question and it seemed like the only threads that had were asking this question, were never answered.

If anyone finds out the answer to this, it would be greatly appreciated.

Thanks
Corey

What shipping module(s) do you normally run on your site?

What shipping module or shipping method are you trying to use for the "cheapest" when you are giving Free Shipping via a coupon?

I only use USPS shipping module. For domestic shipping I give the option of first class, priority, or express mail. I currently have a free shipping coupon with any order so I removed express mail as an option until I stop the promotion.

You could try this by adding the code in **RED **by editing the file:
/includes/modules/pages/checkout_payment/header_php.php

$order_total_modules->collect_posts();
$order_total_modules->pre_confirmation_check();

[B]// bof: change shipping for free shipping discount coupon
  $chk_coupon = $db->Execute("select * from " . TABLE_COUPONS . " where coupon_id = '" . (int)$_SESSION['cc_id'] . "'");
//echo 'Coupon ORIGINAL $_SESSION[shipping][id]: ' . $_SESSION['shipping']['id'] . '<br>';
  if ($chk_coupon->fields['coupon_type'] == 'S' or $chk_coupon->fields['coupon_type'] == '0') {
//echo 'Discount Coupon: Free Shipping! Country: ' . $order->delivery['country']['id'] . ' $_SESSION[shipping][id]: ' . $_SESSION['shipping']['id'] . '<br>';
//echo '<pre>'; echo var_dump($_SESSION['shipping']); echo '</pre>';
    if ($order->delivery['country']['id'] == '223') {
      if ($_SESSION['shipping']['id'] != 'usps_PRIORITY') {
        $_SESSION['shipping']['id'] = 'usps_PRIORITY';
        $messageStack->add_session('header', 'Shipping changed for Free Coupon - Please continue checkout', 'caution');
        zen_redirect(zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'));
      }
    } else {
      if ($_SESSION['shipping']['id'] != 'usps_Priority Mail International') {
        $_SESSION['shipping']['id'] = 'usps_Priority Mail International';
        $messageStack->add_session('header', 'Shipping changed for Free Coupon - Please continue checkout', 'caution');
        zen_redirect(zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL'));
      }
    }
  }
//echo 'Coupon CHANGED $_SESSION[shipping][id]: ' . $_SESSION['shipping']['id'] . '<br>';
// eof: change shipping for free shipping discount coupon
[/B]
//  $_SESSION['comments'] = '';
$comments = $_SESSION['comments'];

This assumes you want to use Priority mail for both US and the Rest of the World ...

You can adjust which shipping methods you want to use based on your needs ...