It only happens once in a lune bleue, so point your Citroen to 1308 Slocum Street in the Design District, where decorator Jan Showers is having a red-tag moment — and only through this Friday. What's marked down? Murano glass lamps, French '40s chairs, an Aldo Tura bar cart, even a Jean Pascaud sofa. Can't promise the rarer bits will still be there by the time you see this, but you'll find something glam, and it will be 30 to 75 percent off. Now that's what we call putting the ooh in ooh la la.