Tiny blunt steel salvage: where to get it

Source	Quantity	Chance per roll
Angry barbarian spirit []	1	2/123
Armoured zombie (Defender of Varrock) []	1	3/128
Berserk barbarian spirit []	1	2/123
Black Knight []	1	1/128
Bronze key black []	1	Uncommon
Bronze key brown []	1	Uncommon
Bronze key crimson []	1	Uncommon
Bronze key purple []	1	Uncommon
Bronze key red []	1	Uncommon
Cyclops []	1	2/100
Enraged barbarian spirit []	1	2/123
Skeleton (Tarn's Lair) (Low level) []	1	5/128
Skeleton brute []	1	2/123
Skeleton heavy []	1	2/123
Skeleton hero []	1	2/123
Skeleton thug []	1	2/123
Skeleton warlord []	1	2/123
Zombie (Lair of Tarn Razorlor) (Levels 72–75) []	1	2/128