ninnypants

function add_some_stuff($content) {
    if (is_post_type('the_store')) {

        $item_name = the_title('', '', false);
        $shopping_url = get_permalink();
        $item_number = get_the_ID();
        $amount = get_post_custom_values('thestore_price');
        $amount = $amount[0];
        $shipping = get_post_custom_values('thestore_shipping');
        $shipping = $shipping[0];
        $shipping2 = get_post_custom_values('thestore_shipping2');
        $shipping2 = $shipping2[0];

        $whateveryouwanttoadd = <<<PAYPAL
                <form method="post" action="https://www.paypal.com/cgi-bin/webscr" target="paypal">
                <input type="hidden" name="cmd" value="_cart">
                <input type="hidden" name="business" value="$mama_paypal">
                <input type="hidden" name="item_name" value="$item_name">
                <input type="hidden" name="shopping_url" value="$shopping_url">
                <input type="hidden" name="item_number" value="$item_number">
                <input type="hidden" name="amount" value="$amount">
                <input type="hidden" name="currency_code" value="USD">
                <input type="hidden" name="shipping" value="$shipping">
                <input type="hidden" name="shipping2" value="$shipping2">
                <input type="hidden" name="handling_cart" value="">
                <input type="hidden" name="bn"  value="ButtonFactory.PayPal.001">
                <input type="image" name="add" src="http://www.powersellersunite.com/buttonfactory/sc-but-01.gif">
                </form>
PAYPAL;

            $content = preg_replace('/<\/p>/', '</p><p>'. $whateveryouwanttoadd.'</p>', $content, 1);

        return $content;
    }
}

add_action('the_content', 'add_some_stuff');