I've trimmed my routine down to using one pipecleaner and one Q-tip per bowl, with a bit of Isopropyl Alcohol for sanitation.
At Smokingpipes.com you can buy bulk pipecleaners for $1.01 per 56, giving you a price of $0.0180 per pipecleaner.
At WalMart you can buy 32fl-oz of 91% isopropyl alcohol for $2.58, which I'm going to say is good for about 1,000 bowls, so $0.00258 per use.
Lastly I like to rub down the bowl with a Q-tip, which costs $2.69/500 (can someone please tell me why packs of 1000 always cost significantly more?) and comes out to $0.00538 per stick.
Coming to total of $0.025995714 per bowl.
Or $0.020615714 if you skip the Q-tip.
Or if you use another pipecleaner instead of the Q-tip, $0.038651429 per bowl.
If you use Whiskey obviously the total is going to be a lot higher, most likely because you're using the supplies on yourself.