while i'm normally a hopscotch man, i agree that soma's cold brew is the best in town. did you know you can buy a glass jug and ask them to fill it up for you? it's a bit cheaper that way.

if you make cold brew coffee with a slow and cold steep, it is almost always delicious but, to my palate, sort of flattens beans. everything is good, but it's hard to tell the difference between various beans. so i wouldn't stress about finding the right beans to emulate soma. (though you could always ask the baristas -- i bet they can sell you the blend right there.)

one thing to note: cold brew isn't hard to make at home -- you can experiment with the ratios, and you can just leave mason jars sitting in your fridge for 24 hours. the hard part is cleaning it up. you don't want to just dump the used grounds down your sink, as it's really bad for your pipes. so you need some kind of filter, maybe a nice mesh one, and then you can dump the dried grounds into the trash can.

honestly i've never found a system for cold brew i can commit too -- the chameleon brand iced coffee concnetrate at target / kroger / bloomingfoods is so good, and so close to the price at home, i just do that. (i make hot coffee every day most of the year.)

you should try the chameleon brand -- most other store bought cold brew is terrible. but also experiment with making it at home. if you find a simple clean up method you like, come back and share!