You require a LED display, media player, content display software, networking, and mounting. You can see LED displays and media players online or visit any showroom to get the best device at the lowest price. For content display software, you can approach a company that develops it because you may not get it online unless the company sells it. The same goes for networking because once you speak to a networking company provider the company will handle from the beginning till end. For mounting, you should approach digital sign board dealers, who can help with hanging the displays wherever you want.
When you start enquiring about all these products and services with the respective service providers, you get to know the pricing as well. Based on your affordability and quality of products, you can decide which one suits your needs well.