So how exactly to start searching for something unique? The easiest way is to figure out designer names behind those iconic designs you see all over Instagram or Pinterest.
For true modernists: Verner Panton, Milo Baughman, Le Corbusier, Mies van der Rohe, Warren Platner, Marcel Breuer.
For mid-century classics (mostly Scandinavian): Eero Saarinen, Ray and Charles Eames, Hand Wegner, Kai Kristiansen, Stilnovo, Charlotte Perriand, Arne Jacobsen, Finn Juhl, Borge Mogensen, Poul Henningsen, Jean Prouve.
For minimalists-at-heart: Isamu Noguchi, Arne Norell, Alvar Aalto, Kaare Klint, Gio Ponti.
For those with unlimited budget (or just searching for a true eye-candy): Vladimir Kagan, Vincenzo de Cotiis, Pierre Jeanneret, Pierre Yovanovitch, Pierre Augustin Rose.
Try searching for those names in vintage sites (such as Pamono, Vinterior, 1stdibs, etc) or ebay and see if you find something you like - soon enough, you'll know exactly what style is close to your heart and how to look for a more affordable alternative.