1, online-second-hand books and periodicals websites: look for some websites of second-hand books and periodicals through the internet, and there are often many expired publications of individuals or businesses on these websites.
2. Online book trading websites: There are some professional book sales websites and overdue publications, usually comprehensive book sales websites.
3. Online-Publications official website: If a publication has its own official website, it will often sell the expired publications of that year at a discount in official website.
4. Offline-Newsstand: Go to some newsstands, where there are often many back issues and even a big discount.
5. Offline-Second-hand Bookstores: There are some second-hand bookstores near many cities or places, and there are usually many expired publications for sale.
6. Offline-library or recycling booth: There are many overdue publications in general libraries, and some recycling booths even sell some books and periodicals as waste paper. You can also look in these two places and buy second-hand books and periodicals.
Periodical, published regularly. Such as weekly, monthly, bimonthly, monthly, quarterly, biannual, annual, etc. Publications shall be published by periodical publishing units established according to law. Periodical publishing units must be approved by the General Administration of Press and Publication, hold a unified serial publication number in China, and obtain a periodical publishing license.