I didn't realize, or forgot, Amazon has some discounts on Wireless service in connection to Tracfone and other providers.
It appears the Tracfone plan offered via Amazon on SlickDeals has carryover data.
"Enjoy your Wireless Service Enjoy your Wireless Service
& 10% credit back!
As an Amazon Prime member, you will receive a 10% credit applied to your Amazon.com gift card balance each time you renew your service."
"Amazon Customer service and billing vs having to deal with Tracfone"