Macys has the Kenneth Cole Reaction Men's Slim-Fit Urban Dress Pants (multiple colors) for $20 with free in-store pickup, free shipping on $49+ or with $3 beauty item filler. Has good Amazon Reviews.
Walmart has the Hanes Men's FreshIQ Boxer Briefs 10-Pack (Solid or Stripe) for $15 with free in-store pickup or $5.99 shipping to home. Soft, stretchable comfort flex waistband. They're available in sizes S to XL.
Ends 7/21. Macys has the Marc New York Men's Motion-Ease Dress Shirt (several colors) for $15 with free shipping when you pad your order with a beauty item (they start at $3); otherwise, shipping adds $10.95. Features slim armholes and sleeves, wrinkle resistant, notched two-button cuffs, all cotton. It's available in select sizes from 14/14.5 x 32-33 to 17/17.5 x 36-37.