It's true that most iPad cases that you buy today can also double as an iPad stand. Usually the cover flips around and forms some sort of stand so that you can prop up your iPad to watch content or read. However, the cases usually will only allow the iPad to stand in portrait or landscape mode, not both. This is the reason that I use iPad stands. I actually have a couple of favroites:
My travel stand
My favorite stand for travel is the Arkon Portable Foldup Stand for iPad and other tablet devices. It's lightweight and folds up nicely to fit in my computer bag. It's also very adjustable to get the pefect viewing angle.
You can get it here for under $13.
My second favroite stand is the Stump
This simple design is great for allow you to place your iPad in 3 positions both horizontally and vertically. I like this one too for the 1st postion you see in the image above where the iPad is slightly elevated instead of lying flat. If your organization is looking for a cool give-away item you can even order these with your company logo on the back.
You can get the Stump here for about $30.