RLTD Men's Boxer Briefs Socks Underwear Set, Shield|Refinery, Small, 6 Piece 2 Pack at Amazon Men's Clothing store
Men's Rock Em Socks Atlanta Falcons All-Over Logo Underwear and Crew Socks Combo Pack
SmartKnitKIDS Seamless Sensory-Friendly Sensitivity Socks 3 Pack and Boxer Brief Style Seamless Undies (Black/Grey/White X-Large & Black Medium)
I'm not above thrifting socks and undies. Found these, along with running shoes, a bathrobe, and some great clothes on my recent trip to the bins. : r/ThriftStoreHauls