Display Quantity Discount Price on front page

Hi I followed the advice on this thread

http://www.zen-cart.com/showthread.php?36263-Quantity-Discounts/page7&highlight=lowest+discount+price

and modified my modules/featured_products.php file from this:

    $products_price = '<strong>' . zen_get_products_display_price($featured_products->fields['products_id']) . '</strong>';

to this:

$products_price = '<strong>' . zen_get_products_discount_price_qty($featured_products->fields['products_id'],20000) . '</strong>';

and it displays the price I expect but with a decimal place missing?

so I updated the above line to this:

 $products_price = '<strong>' . zen_get_products_discount_price_qty($featured_products->fields['products_id'],20000) . '</strong>';
 $products_price = number_format ($products_price, 2);

But now all the prices in the fetaured products box are displaying as £0.00

I've looked ta this for a few hours now and cant figure it out?

site can be viewed here:

http://www.yorkshirewiper.co.uk/

Grateful for the communities advice?