Trying to scrape Aliexpress

So I am trying to scrape the price of a product on Aliexpress. I tried inspecting the element which looks like

<span class="product-price-value" itemprop="price" data-spm-anchor-id="a2g0o.detail.1000016.i3.fe3c2b54yAsLRn">US $14.43</span>

I'm trying to run the following code

'''

import pandas as pd
from bs4 import BeautifulSoup
from urllib.request import urlopen
import re

url = 'https://www.aliexpress.com/item/32981494236.html?spm=a2g0o.productlist.0.0.44ba26f6M32wxY&algo_pvid=520e41c9-ba26-4aa6-b382-4aa63d014b4b&algo_expid=520e41c9-ba26-4aa6-b382-4aa63d014b4b-22&btsid=0bb0623b16170222520893504e9ae8&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_'

source = urlopen(url).read()
soup = BeautifulSoup(source, 'lxml')
soup.find('span', class_='product-price-value')

''' but I keep getting a blank output. I must be doing something wrong but these methods seem to work in the tutorials I've seen.