You can just go in. I've been there twice in the last month. They might gave you wait outside, as they're limiting the number of customers in store & all samples are display only.
No appointment necessary. You may have to wait in line a bit..
You have to wait outside as they do let a few customers go inside at a time.you cannot test anything.if you are certain about getting any specific product then they can get it for you while you are waiting in the line.
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