Now days find an iPhone 7 Plus is an hard mission. This is a simple script to check if it's available on the GiffGaff shop.

giffgaff_iphone7_availability_checker.rb

require 'watir'
require 'highline'

MEMORIES = ['32GB', '128GB', '256GB']
COLORS = ['black', 'gold', 'jet black', 'rose gold', 'silver']

cli = HighLine.new

memory = cli.choose do |menu|
  menu.prompt = "Please choose the iPhone's memory:"
  menu.choices(*MEMORIES)
  menu.default = '128GB'
end

color = cli.choose do |menu|
  menu.prompt = "Please choose the iPhone's color:"
  menu.choices(*COLORS)
  menu.default = 'black'
end.sub(/\s/, '-')

p '[*] Booting an hidden browser'
@browser = Watir::Browser.new(:phantomjs)
p '[+] Visiting GiffGaff web page...'
@browser.goto('https://www.giffgaff.com/mobile-phones/apple/apple-iphone-7-plus/phone-details')
p '[+] Checking availability for your settings...'
@browser.elements(id: 'phone-memory-apple-iphone-7-plus').first.li(text: memory).click
@browser.elements(id: 'phone-color-apple-iphone-7-plus').first.li(class: color).click
result = @browser.elements(class: 'phone-stock').first.elements.last.text
p "[+] Result: #{result}"

exit