Aesthetic Apparatus is run by Dan Ibarra & Michael Bysewski.
They are located in Minnesota. They started off silk screening limited-edition concert posters and they have expanded into a full-time graphic design studio.
Plus, when you view a poster on their site, there's a blurb on the side about the client and the poster, which can be helpful to aspiring designers.
You can purchase their work on their website [www.aestheticapparatus.com]. The prices are definitely affordable.
CLICK ON A POSTER TO VIEW IT BIGGER!! =]
I love how Aesthetic Apparatus combines images in their posters, esp in the first poster at the top. Make sure to view it bigger to see all the images that are in there!!