Flat rate shipping with a minimum purchase

I would like to do flat rate shipping on all orders above a minimum purchase of $75. Orders below that threshold would pay standard UPS or USPS rates. Is there a way to do this?
-thanks

You can control this by customizing the shipping modules ...

To not show the Flat Rate flat shipping module you can add the code in red:

      // disable only when entire cart is free shipping
      if (zen_get_shipping_enabled($this->code)) {
        $this->enabled = ((MODULE_SHIPPING_ITEM_STATUS == 'True') ? true : false);
      }

      // bof: do not show if <= $75.00
      if ($order->info['total'] <= 75) {
        $this->enabled = false;
      }
      // eof: do not show if <= $75.00

Then, to allow UPS or USPS reverse the logic and place the code in red in approximately the same location so that the shipping does not show on orders > $75.00 ...

      $this->enabled = ((MODULE_SHIPPING_USPS_STATUS == 'True') ? true : false);
      // bof: do not show if > $75.00
      if ($order->info['total'] > 75) {
        $this->enabled = false;
      }
      // eof: do not show if > $75.00

Ajeh,
Which php file would need to be modified?
Thank you for your help
-john

Your shipping modules code files are located in:
/includes/modules/shipping

Flat Rate is flat.php
USPS is usps.php
UPS is ups.php

Ajeh,
As if you didnt already know. This worked perfectly. :D
thank you very much!!!
-john

Thanks for the update and glad that this is now working for you ... :cool:

OK, this is working perfectly. But now I have a new issue. We would like to add some items to the store that are very heavy, but fairly inexpensive. I would like to have these new products omitted from the flat rate shipping mod that we have done. Or in other words, I would like to charge actual shipping costs for just some specific items.

I know I can add a flat shipping fee onto these items, which we already do for for expensive products that are also expensive to ship. Unfortunately, due to the price of these items, charging a nearby customer the same shipping fee as someone across the country will just cost sales. Is there a way to just omit certain items from this mod?

thanks
-john