We just bought a house and there was a dusty Shark Navigator NV105 in one of the closets. It has seen some use and abuse. Some filters were missing altogether and it was clogged with dirt. But when I plugged it in, it still worked! I decided to do a little shopping around for filters and spares and lo and behold they were in stock. They arrived just in time for me to clean up the carpet mess left by the plumbers. The shark is back!