得到那张海报用英语怎么说

To obtain that poster, you can say "I want to get that poster" or "I want to buy that poster." The source of the poster could be a store, a website, or a person who has it for sale. Here are some example sentences and their translations:
"Can you help me get that poster?" (你能帮我得到那张海报吗？)
"Where can I find that poster?" (我在哪里能找到那张海报？)
"I saw that poster on a website and I want to buy it." (我在一个网站上看到了那张海报，我想买它。)