We installed a 24’ rail system in under two hours and now have a hallway that looks like a professional art gallery. Best of all, we can change and rearrange our art without having to patch and create even more little nail holes in the wall.
Many variables that go into the final cost (type of system, finish of the mounting rail, number of pictures, length of wall, etc). For the wall we did, we used the click rail system and spent around $300 (this includes shipping) for a 24' wall with 10 pictures varying in size on the wall.
The prices are very clearly laid out on the website and it's extremely easy to figure the final cost with their shopping cart feature.
More info: AS Hanging Systems