You can get authentic Arduino products from the Arduino store:
and from the official Arduino Amazon web store:
When shopping on Amazon, be careful because Amazon is a marketplace with many vendors. Many of the vendors who sell products that mention the word "Arduino" in their description are selling derivative products that frequently use the CH340. So make sure that the Amazon seller you purchase from is either Arduino or one of Arduino's authorized distributors.
You can get authentic Arduino products from Arduino's authorized distributors:
Note that these distributors may also sell Arduino compatible products from other manufacturers, some of which might use the CH340. If they are advertising something as a genuine Arduino product, then you can be confident that it is so, but don't assume that all the products they sell are manufactured by Arduino just because they are Arduino distributors.
There are also Arduino compatible products manufactured and sold by reputable companies and you can trust in their claims regarding which USB interface chip is used.