inquiring about blunts

i started smoking recently and ive noticed that since i dont own a pipe or anything, blunts are the easiest and most convenient way to smoke. however, ive only been filling up a small fraction of the cigars because i didn't want to use all my stuff at once. how much do you guys think it would cost to make a blunt out of a swisher/white owl, leaving about 1/5 tobacco?