Jos. A. Bank offers its Jos. A. Bank Men's Reserve Collection Merino Wool-Blend V-Neck Sweater in several colors (Blue pictured) for $19.96 with free shipping. (Click "show all sizes" to see regular-price options at this price; the link defaults to big & tall sizes and prices.) That's $110 off and the lowest price we could find, although we saw it for $5 less three weeks ago. It's available at this price in select sizes from S to XL. (Larger sizes start at $27.99.)
Making even one of these mistakes can easily cost you tens of thousands of dollars.