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Who said it didn’t sell out? That’s presumptuous.
I can still pick up a 13-inch iPad Pro (Wi-Fi) with the 256 GB + Magic Keyboard today, in store. If it is popular, it would've sold out:

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I can still pick up a 13-inch iPad Pro (Wi-Fi) with the 256 GB + Magic Keyboard today, in store. If it is popular, it would've sold out:

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Basically, you just assumed based on your own purchased on one single model on one shop and based on the idea “just because it is still available it means it’s not popular.” iPad is not iPhone but it is sure very popular. Most people buy the base model and in my area it’s already backlog to August.
 
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