<div class="product__item-price"><b>от</b>&nbsp;239 992&nbsp;<span>₸</span></div>    

Вообще нет div'а с классом product__item-price

<div class="product__item product__item-js tile-container"

data-price="299990.0"

<div class="product__item product__item-js tile-container"

data-price="439990.0"

  
>>> import urllib.request
>>> import bs4
>>> 
>>> def f(url):
...     with urllib.request.urlopen(url) as data:
...         text = data.read().decode('utf-8')
...     doc = bs4.BeautifulSoup(text, 'html.parser')
...     product = doc.find(class_='product__item product__item-js tile-container')
...     out = product['data-price']
...     return out
... 
>>> f('https://www.sulpak.kz/g/noutbuki_acer_extensa_15_ex215_52_i382sun_nxeg8er00b')
'299990.0'
>>> f('https://www.sulpak.kz/g/noutbuki_acer_nitro_5_an515_57__i5165sgn_nhqeker004')
'439990.0'
>>>