Cast Iron Half Umbrella Base - 17.7 Inch Diameter by Trademark Innovations - On Sale - Bed Bath & Beyond - 16180849
40lbs. Half Wall Umbrella Base - 040SQBK
Half Round Umbrella Base Half Patio Umbrella Stand Holder for 1.5 , 2 Pole, 1 Unit - Gerbes Super Markets
Amazon.com : Pure Garden 50-LG1211 Half Moon Umbrella Base-34 Pound Weighted Semicircle Stand-Fill with Sand-for Outdoor Use on Patios, Balconies or Decks, Black : Patio, Lawn & Garden