Chaps Boys Stretch Twill Pull-On Pants, Sizes 4-18 $5
Boys pull-on Twill Pants – $4-6 each, on sale at Walmart. Might be free for pickup (YMMV) and some sizes in stock for shipping with Walmart+.
https://www.walmart.com/ip/Chaps-…2%5D%7D%5D
QA note: price may vary by size and color and may also vary by location, YMMV