Save! Give the gift of oxygen travel for your loved one! Inogen G5 Portable Oxygen Concentrator, includes case, 2 standard batteries, one extended battery, extra unused column kit, one wall plug in and 2- vehicle chargers. Selling for $3200 or best offer (OBO). Retail New: $4200! Save yourself $1000! Barely used for a few weeks. Purchased directly from Inogen.