You're aware that if you search for anything on amazon/aliexpress, your search will be associated with your browser profile/ip and logged by them, and by your ISP, so they'll perfectly know what you want to get?
You're aware too that giving the website you search for your information, for the maturation of your own ideology, they perfectly can know what you'll try to buy in the next future?
Protip: If you want anything anonymous, buy it in cash, and don't put anything related to it on the internet (if you're not behind 7 pr0x14s). Don't touch a fucking computer, especially if you're retarded enough to ask such a question. You're on their network, using their computer and their processor.