Get Product Discounted Price

test.php

<?php

// add qty to cart to trigger dynamic pricing
$cart_item_key = WC()->cart->add_to_cart('8','300');

$product = wc_get_product( '8' );
echo "NAME: " . $product->get_title() . "\n";
$price = $product->get_price();   
echo "PRICE: " . $price . "\n";

/*
Currently this is output:
NAME: Dinosaur Shirt
PRICE: 10

Expecting price to drop to 4.5
*/

// remove qty from cart
WC()->cart->remove_cart_item( $cart_item_key );

@lucasstark
It's a simple product with some quantity price changes:

I'm not sure if that's an advanced or simple rule.

I think i see what your asking, for a function that you can manually pass a different quantity to to get what the discount would be at that amount?

Yes, exactly that.