Here below are the ranking according to the article that you can buy direct from Japan store on Rakuten Global (some stores need to arrange forwarding service)
If you have interest, follow the link and compare the price with your local store. And don't forget of the shipping cost and import duties.
And it's really good to prepare for emergency. But don't forget to try before emergence!
Find a new Cup Noodle and enjoy fresh at a reasonable price!