Amazon has Amazon Essentials Men's Closed Bottom Fleece Sweatpants (Grey Camo, various sizes) on sale for $10.90. Shipping is free w/ Prime or on $35+ orders.

Available sizes:

• X-Small
• Small
• Medium
• Large
• X-Large
• XX-Large

About this product:

• Comfortable, easy fit through the hip and thigh with a straight leg. Sits at the waist.
• Cut from soft, brushed-back, cotton-polyester blend fleece in a midweight for staying cozy and keeping warm.
• Enjoy all day comfort with these cozy and warm brushed back fleece sweatpants.
• Features elasticated waist with internal drawcord, hip pockets, and elastic at cuffs.