$200 for a used iPad 7 (2019) with 90-day Woot warranty?
Perhaps, but note the street price for the latest mainstream iPad 9 (2021), new, with 1-year Apple warranty is $260-280. A proper battery replacement by Apple is $99, but unless the used iPad 7 battery was abused, the battery will likely be fine. Only you can determine what that $80 savings is worth to you.
For that +$80, you’re getting that warranty, an A13 cpu vs A10 (in both the iPad 6 & 7), 64GB storage vs 32GB, a 12MP front camera vs 1.2MP, and Center Stage - that tracks you in the frame in video calls. That improved camera will also be helpful for video calls and the iPad makes an excellent video call device since you can see more images of the participants vs a phone… and you leave your laptop free for other work.