I've only ever been to Lunchbox on sunny Sunday afternoons, when my husband is all, "Hey, Grinderman has a new album out - let's go to Lunchbox." When we get there, husband buries himself in the used section and does his whole flip-through-every-single CD in search of untapped gems (he generally comes away with two or three), and I surf along the top, occasionally dipping beneath the surface to come up with old mid-nineties rock albums I never bought but always wished I had.
Lunchbox is a small but truly great place to buy music, even if you don't get past the first shelf (which is stocked with lots of excellent new releases).
Also, it's next door to the Dairy Queen, which is a must on a sunny Sunday afternoon.
Lunchbox + DQ beat the Sunday afternoon blues every time.