How are preloved phone stocked, acquired?

I've been looking to upgrade my phone for around 2 months now. I have my eyes on the Galaxy s20 FE, and the deal in the Preloved Phones section is very tempting. However, I didn't see any S20FE (color and state) that was in stock in the last two months.

Are thoses phones in very low supply? Is there a way to get a notification when one is in stock (like a sort of wishlist)?

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