Apple Store offers $70 btw

There is a $90 off on series 10 (gps + cellular) plus a 90 day return window at Costco (US) - Online only offer. While the color/band choices are limited, they have what I need. Any downside in buying from Costco? Are the products legit or may be imported from a different country or something? Is it going to be a hassle later in case of any issues compared to buying from Apple store ?

Edit : Since all the replies so far has been negative and expressing concern that this could be rage bait and that I am not a Costco member etc, I just wanted to clarify why I asked the question. I am a Costco member, but very inexperienced with buying electronics there. I did a google search on why the price could be lower at Costco and google AI said there could be risk of product being illegitimate as a downside.

Plus, my own experience of seeing posts in the past about inferior products like expensive fragrances from Costco and people complaining of it being fake etc. You can see some of this in the product reviews in Costco website as well. I do not know if any of that is true. I personally don’t think it could be true. But as I am unsure, I asked here.

My post was no way against Costco or to say something bad about Costco. Based on the above, it was a genuine question to see if there really is any downside versus buying directly from Apple. I thought people with more experience may know and be helpful.

Thanks everyone for the time and please don’t see this as a negative question and hate on me for asking.

Looking to get an Apple Watch mainly to track sleep/heart rate. Does it go on sale at Costco, or is there a new version coming out soon that I should wait for?