As some have already said, I don't impulse buy because I am too broke for that. I did impulse buy Mr. Bungle - Disco Volante once because I couldn't get all the cds I actually wanted and thought "fuck it, I'll buy this instead and get a whole bunch of genres". I never listen to it, so it wasn't a particularly good buy.
All the stores I shop at are corporate, except for that place in Iceland, so there is hardly any service, much less friendly service.
The place in Iceland, which I sadly can't remember the name of, had a really boring floor with classical and shite. But they had this indietastic cellar, where there was a whole rack dedicated to "In the Aeroplane over the Sea", why the fuck I didn't buy it I don't know. I bought Björk, Sigur Rós and My Bloody Valentine instead.
New cds in Denmark cost around 28 USD, which I think is insane.