Hi – great site!
You’ve got a couple of options. One is to override and customize the single-event.php template then locate and remove the following section of code:
<?php if ( tribe_get_cost() ) : ?>
<span class="tribe-events-divider">|</span>
<span class="tribe-events-cost"><?php echo tribe_get_cost( null, true ) ?></span>
<?php endif; ?>
Alternatively you could add a CSS rule in an appropriate location (like a custom tribe-events.css stylesheet) as follows:
.tribe-events-cost { display: none }
Please do see our Themer’s Guide for an overview of setting up both template overrides and custom stylesheet. Let me know if that helps!