Need propane for your grill, firepit, patio heater, generator, or other propane appliance? Just Drop, Swap, and Go with Blue Rhino at Blue Marlin Supermarket! Drop your empty by the Blue Rhino display, see a store representative to swap, and go! It’s that easy. You can also get a tank without exchanging. Every tank is cleaned, leak-tested, inspected, and ready-to-use. Blue Rhino. It’s not just propane.