It works if you change it to
doc.css('div.pl-item-content').each do |item|
puts item.css(".pricing-info-container .product-prices td.col-price").text.strip
end
On nokogiri documentation it says:
- (Object) at_css(*rules)
Search this node for the first occurrence of CSS rules. Equivalent to css(rules).first See Node#css for more information.