Best Buy offers Existing Verizon Wireless / AT&T Postpaid Customers select Factory Unlocked Motorola 5G Smartphones starting at $39.99 when you purchase/activate the device on a New Line added to your current account. Shipping is free or select free store pickup where stock permits.

Thanks to community member ProudToBeAnIndian for finding this deal.
Note: Availability for pickup may vary by location.
Deal Instructions:
Must be an existing Verizon Wireless or AT&T Wireless postpaid plan customer / accountholder.
Purchase an unlocked Motorola device by selecting "We'll help you connect this phone to a carrier" on the product page:
128GB Motorola Moto G 5G 2023 (Unlocked) $39.99
128GB Motorola moto g power 2024 5G (Unlocked) $99.99
256GB Motorola moto g stylus 5G 2024 (Unlocked) $149.99
128GB Motorola razr 2023 (Unlocked) $249.99
Login to your carrier account (Verizon / AT&T) during the checkout process.
Open / add a new line to your account (plan line costs may vary)
Purchase the device via your newly added line at checkout.
Upon pickup or shipment & receipt of your unlocked, paid-in-full Motorola device, you may continue to pay for / keep the newly  added line active if desired, for as long as you desire. 
Otherwise, you may cancel the line at any time (given you do not owe any payments to Best Buy, Verizon or AT&T for the phone and you are not required to keep the line active for any minimum amount of time).
Your new Motorola device is factory unlocked by default, out of the box and can be used on your current carrier (Verizon / AT&T) or any other compatible carrier/service provider.
Note: An activation fee (typically ~$35) may apply.