Several years ago I thought it'd be smart--and economical--to buy a full gallon of Titebond II, my favorite carpenter's wood glue. At the time I was buying 8-ounce bottles of the yellow glue, paying about $5 each. So, I bought the gallon jug for only $20, saving 75 percent--or $60--over the cost of the small bottles. Great idea, right? Well, almost.