Where the price variable stored?

If you look at the woocommerce-template files for the shop loop or single-product, you can see that in order to display the price it is used as:

global $product;
echo $product->get_price();

This is the needed woocommerce functions.

But if you are asking the whereabout of the “price” in the “database”, than it is not that simple 🙂
But basically it is restored in a combination of (posts) and (postmeta) tables.

(posts) table have the product id
(postmeta) table stores the price-value in the (meta_value);
where (meta_key= “_price”) and (post_id= the product-ID from posts table)

Try looking at the WooCodex for detailed usages for those Woocommerce functions, hooks, etc…