U CAN FILL AT VIC HUBBARDS IN HAYWARD, 10 LB TANK IS ABOUT 50. MOST PLACES EMPTY IT AND REFILL IT BUT THEY SAVE U MONEY SO THEY JUST FILL FROM WHERE EVER ITS AT. FOR EXAMPLE, U GOT A 10 LB TANK AND GOT 3 LBS LEFT, THEY WILL JUST CHARGE U FOR 7 LBS.