teched101 is a web site that offeres free posters. They seem reliable
OSHA offers free health and safety posters for the workplace. These can be downloaded from their website or a pre-printed version can be requested by filling out a form. Visit the osha.gov site and click on "OSHA Poster" to download or request the poster.
There is a variety of different places that you can purchase an Osha Poster for a good price. Some of these are Osha Publications. Someone could also acquire to receive a poster free of charge.
Yale (the manufacturer of forklifts, not the college) offers free forklift safety posters. You can request one by visiting this link: http://northamerica.yale.com/free_poster/free_yale_poster.htm
Here is a simple poster template for a school event: Event Title Date: Time: Location: Details: Contact Information: Feel free to customize the template with your event's specific information and design elements.
You can download a free California labor poster directly from the California state website. The url to click is http://www.dir.ca.gov/wpnodb.html.
OSHA.gov offers this poster for free on their home page. You can either download it or open it as a pdf and print it right off of the site, free of charge.
I checked the Flinn Scientific website, but they don't sell them directly, as far as I can tell. I think that they do give them free to new teachers, though, in a kit.
One could get a free bible for children to use in school by going anywhere that gives away free bible. Some places could be church and other religious places.
safety-cartoons.com offer free safety cartoons.
you can buy a CD of camp rock and get a poster for free were ever cds are sold but he mght not be alone.
It is 100% free, unless you want to order stuff like your picture on a poster.
If you are a student, then a poster can add visual interest to your topic and help to keep you audience focused on the message of your presentation. If you are a teacher, posters can help make learning fun because they allow some creativity (and if done in class, they can eat up some time.) Many people use the free poster tips and tools at http://www.artskills.com to help them make better poster designs. There is even a free poster design book being given away on their site.