Proozy offers the Reebok Men's Knit Lounge Pants in Dark Charcoal Heather or Light Charcoal Heather for $14.99. Coupon code "DNSALE" cuts that to $6.50. With free shipping, that's $3 under yesterday's mention, $14 off list, and the lowest price we've seen. They're available in select sizes from S to XL.
None of these moves requires a big investment, and they all can save you money.