Is it an advertisement to show the product price on the US Mission?

It belongs to advertising. Advertising is a kind of propaganda means to convey information to the public openly and widely through certain media forms and at a certain cost for a specific need. Advertising, as its name implies, is to tell the general public something widely. As far as its meaning is concerned, advertising can be divided into broad sense and narrow sense. Non-economic advertisements refer to advertisements that are not for profit, such as government announcements, notices and statements of political parties, religions, education, culture, municipalities and social organizations. Economic advertisement refers to an advertisement for profit, usually a commercial advertisement. It is a means to spread the information of goods or services to consumers or users in a paid way through advertising media in order to promote goods or provide services. Commercial advertisements are such economic advertisements.