You can format the results so that you get $5.00 adding a dollar sign where the value would display, then using a decimal formatting function to add the .00 to the number. This will require you to make the changes in the code on your results page. Here is a link to the number format function page so you can see how that works.
php.net/manual/en/function.number-format.php
If this is something that you would like help with to implement post back with your results page and I will show you where to put the code.