Old Navy just added a new Superfan Nation department for NFL and collegiate apparel, including Vikings and Gophers merchandise for men, women, kids and babies. Today through Monday (Labor Day), anyone who buys $30 worth of merchandise from Superfan Nation gets a coupon for a free large, 2-topping pizza at Dominoes.
Prices seem to be reasonable, about $35 for a men's hooded sweatshirt, for example, and $20 a men's tee. Old Navy sells merchandise for 32 NFL teams online and many universities too, including the Gophers and Badgers. Find Vikings and Gophers and a little Packers merch in the TC stores now. If you're a Patriots fan, I can't help you, but check online anyway.
I can't say if prices are cheaper than Target or Walgreens without checking but they're certainly cheaper than what you'd find at the Dome.
