Moto G7 Play from Amazon, $150 flat. It's unlocked and says it is Sprint compatible, so it will work with Tello.
Which phone did you get? I saw it on Slickdeals but then saw so many people getting SIM error and having to email customer service to get the rebate so refrained myself to post about it here lol.
I am thinking of buying this Moto E - https://www.amazon.com/Moto-Unlocked-Motorola-Camera-XT2052-1/dp/B086H3HH5V
Or G7 Play - https://www.amazon.com/Moto-G7-Play-Unlocked-Warranty/dp/B07N9MF1Q3