War Paint Legguards has the highest item level here (11). The lowest listed price among them is Infantry Leggings at 76 silver in the US Auction House.
Blizzard numbers items as they are created, so the named items next to ID 233886 (233881 to 233891) were usually added in the same batch as Hydraflayer Legguards: the same quest line, zone, vendor or reward set.