A card that costs $100+, about once a day.
A card that costs $250+, about once a week.
I did once sell 4 dual-lands in a week, all in different transactions, but that was a fluke. Also, I was trying to sell them as a personal challenge.
Edit: This was a physical store, I assume larger mostly only stores would sell more.
I went with the Razr (2023), and it's great. It was cheap, it gets small, and the screen is on the inside, meaning I don't need to worry about things scratching it, and the battery lasts a long time.
If there is another similar phone when I go to replace mine, I will grab it.
If all the market offers me is an expensive phone with a giant outer screen, I won't.