Unaffected, in every way, by retro hype, Shoppie Seconds prices its wares, displayed in jumbled, Raiders of the Lost Ark warehouse-scene infinity, as if it realizes that some of this stuff is actually not very valuable. You can, nonetheless, snag authentic Atomic Age plastics, mad housewife shifts from the Fifties, and nearly-new mod furniture at u-carry bargain basement prices. A recent expedition yielded four minimalist-yet-chunky dining room chairs for $105, an authentic Joan Jett and the Blackhearts tour T-shirt for $5, and a vintage orange chiffon maxi cocktail dress of indeterminate (Forties? Sixties?) decade origin for $15. And the proprietors -- fun to visit with even if you're not in the buying mood and always generous to the neighborhood's many ne'er-do-wells -- are decent, honest, and willing to make a deal.