it's a special price that won't last long then you can use the chat feature to contact them and give them the link. So put the item in your cart then chat with their rep and they adjust the price of the item in your cart for you. I did it when I got my last TV and it worked great. The rep was already familiar with the deal I was trying to price match and didn't even ask me to provide a link or anything. I'm sure they're already familiar with all the other Black Friday promos out there.

Put in the info then select the chat at the bottom.
https://www.amazon.com/gp/help/contact-us/general-questions.html?skip=true