Best Buy Email Offer: Surprise Reward Certificate Savings $5 or more (Select Accounts) (YMMV)

Best Buy offers Select My Best Buy Members (free to join): a Reward Certificate for $5 or more via Email.
Note, offer is sent via email to My Best Buy members in good standing as of 04/19/19.
Steps
Look for an email from Best Buy titled " Surprise! Your bonus $5 reward is waiting!."
This reward is in your My Best Buy account and ready to use. But don’t wait too long! It’s valid for a limited time.
Certificate starting with : 4809
Expires : 05/05/2019
See terms and conditions
In Store
Show your member ID at checkout.
Find a store
Online or Mobile App
Sign in and apply your reward on the payment page.
Terms and Conditions
Limited time only. This reward is redeemable in any U.S. Best Buy retail location or online at BestBuy.com. Once redeemed, the reward is no longer valid. If purchase is returned or exchanged, the reward will be void and not reissued. Transaction subtotal must be greater or equal to the reward value. Otherwise good toward the purchase of any eligible product or service. Not redeemable for gift card purchases and certain products and services. Not redeemable for cash. No rainchecks. Not valid on prior purchases or as payment on your Best Buy credit card. This reward is value until midnight (CT) on the expiration date shown above. Reward is subject to the My Best Buy Terms available at BestBuy.com/MyBestBuy, except for restrictions noted above.
Cashier Instructions:
Look up or scan the member ID bar code to add the member to the transaction (required). Scan all items and select Total. Select my Best Buy Certs/Offers from the menu and click on the certificate(s) to add it to the transaction.
https://www.bestbuy.com/loyalty/rewards