Woocommerce use if statement on checkout page

Need a little help please. I'm working on a Woocommerce site. On the checkout page for individual products i would want to issue an if statement based on that item's price.

Something like this:

if ( $_this_item_price > 30){

echo 'blah blah blah' } else{ echo ' something else'}

I'd want the statement to be around that item's price. And also where should I paste the code. The file structure of WP confuses me.

Thanks a lot in advance. Bless!