Habitat for Humanity has 3 ReStores in OKC, this one just north of downtown, another on the southside at SW 29th St at May Ave, and their newest location off I-35 at SW 49th and High. There is also a ReStore in Norman.
This store has some new (surplus) items like floor tiles, wood flooring, paint, wall paper, etc. They also have used items like bathroom fixtures, lighting, ceiling fans, and window air conditioners. They have tools and fasteners for sale.