I can get a can for $6 at Menards locally, but it's $8 at Advance Auto. FWIW, Deep Creep (by Sea Foam) is good stuff too, but unless you plan to also use it to free stuck bolts, etc. (and PB blaster pry is better for that, plus cheaper) you might as well just use regular Sea Foam as it's a better bang for the buck IMO. However, Deep Creep would be my first choice to spray down the spark plug holes on a seized or hydro-locked engine.