Amazon no longer provides the option to filter by specific sellers. I mostly buy items sold and ship by Amazon.com itself. Well, the current fix is adding the below string to the end of browser URL:
&emi=ATVPDKIKX0DERFor example, when searching “nvme enclosure”, the default URL is like below, and it lists mostly 3rd-party sellers:
https://www.amazon.com/s?k=nvme+enclosure&i=computersBut if you add “&emi=ATVPDKIKX0DER” to the end of above URL:
https://www.amazon.com/s?k=nvme+enclosure&i=computers&emi=ATVPDKIKX0DERnow the searching results are sold by Amazon.com itself.
Reference: https://www.reddit.com/r/amazonprime/comments/13nyl2k/amazon_no_longer_offers_the_option_to_filter/