How do I show my containing my custom field ONLY if there is a set value on that custom field? [closed]

You can use get_field from ACF to check if the field is available and according to the documentation how you conditionally check if a field has contents.

<div class="wrapper">
    <?php if (get_field('discount')) { ?>
        <p>Discount: <?php the_field('discount'); ?></p>
    <?php } else {  ?>
        <p>Price: <?php the_field('price'); ?></p>
    <?php } ?>
</div><!--wrapper-end--> 

This should give you what you want.