I received the following email earlier this afternoon.
In my experience, Citi has had one of the most generous and fastest price match programs of all the ones I've tried (I've also price matched with Discover and Chase). I've had favorable decisions in as little as 2 days and in about 4 days on average. I like the email option because I'm able to send them one complete packet arranged chronologically (which probably contributes to the fast turnaround). Discover has been the slowest and least efficient (you actually have to call first).
Hopefully the new process is at least as efficient as the current email option.
Please be advised that beginning October 18th, 2017, new Citi Price Rewind benefit requests must be submitted via www.citipricerewind.com, or by mail or phone at the mailing address/phone number listed below. We will no longer process new Citi Price Rewind requests received via email or fax after this date.
Also starting October 18th, 2017, you'll be able to submit Citi Price Rewind benefit requests on lower prices you find on your own through www.citipricerewind.com.
If you have any questions, please call the Citi Card Benefits service center toll-free at 1-866-918-4670. Our representatives are available 24 hours a day.
Citi Card Benefits Administration
PO Box 87719
Chicago, IL 60680-0919