walmart.com has 5-Pack Boys' Underwear or Boxer Briefs for $4.10. Shipping is free w/ Walmart+ (90-Day Free Trial) or on orders $35+
- 5-Pack Spider-Man: Into the Spiderverse Boys' Underwear $4.10
- Sizes: 4, 6, 8
- 5-Pack Spider-Man Brief Underwear $4.10
- Sizes: 4, 6, 8
- 5-Pack Spider-Man Marvel Boxer Brief $4.10
- Sizes: 4, 6, 8, 10