This is the barcelona stool by Ludwig Mies van der Rohe (or at least a really good knockoff, because at around $2000 they're not cheap)

Anyways, here are a few links of design stores that carry this piece, but they're all pretty similar when it comes to price and selection. This is definitely an investment piece, but it's also an icon and, personally, a piece of art.

<a class=" http://www.dwr.com/product/living/ottomans-benches-stools/stools/barcelona-stool-volo-leather.do?sortby=ourPicks" href=" http://www.link.com" target="_blank">designwithinreach</a>

<a class=" http://hivemodern.com/pages/products.php?view=sub_product&sid=479" href=" http://www.link.com" target="_blank">hivemodern</a>

<a class=" http://www.yliving.com/knoll-barcelona-stool.html" href=" http://www.link.com" target="_blank">YLiving</a>

Thank you.
Happy Thanksgiving.

Here's a similar version:

http://www.leatherchairstore.com/IVG2/Y/ProductID-2621-Ottoman-Modern-Button-Tufted-X-Base.htm