Not only is there a ton of inventory on clearance over at Jos. A. Bank right now, but through today you can use coupon code PFD87 to take an additional 50% off those items. Hey, it works on regular-price stuff, too, but I know you want the biggest bang for your buck.
I know I post about this place fairly often; they have classic, quality menswear at decent prices when you get it on sale like this. Good stuff all around.
So go on—make him look like a million bucks without spending that much.