When I trained range on fire giants i got like 100 blue charms or more their not likely to appear though that's just one of the monsters that drop them try going to a runescape help site and type in monsters that do drop blue charms.
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There are a lot of monsters that drop blue charms, but they are extremely rare compared to other charms. The monsters that drop blue charms the most are Abberant Spectres and Gargoyles.
Well, A cheap way to do it is just killing gargoyles.. They drop a fair amount of blue charms.. Usually more than gold. Bork has 100% drop rate of 5 charms but you can only kill 1 per day. Kbd, Mithril dragon, Aquanite and few other drop it common. If you have enough hunting lvl to catch spirit impling, it also have fair rate of loot.
Gold charms are obtained mainly from monster drops and are deemed by many as the most common charm obtainable. Many monsters drop them although hellhounds and firegiants drop them the most frequent. Less conventional ways to obtain charms are either by thieving them from Dorg-esh Kaan chests or by trading in zeal points for them at the Soul Wars minigame.
The following drop 4 Green Charms:King Black DragonMithril DragonThe following drop 3 Green Charms ( the better option ):Giant Rock Crab ( Level: 137 )Black Dragon ( Level 227 )
Of couse!If your asking about nonmember monsters, then there is the level 83 lesser demon that has a rare rune medium helmet drop. There is the level 82 Cockroach Soldier that has a rare drop of a rune scimitar or a rune kiteshield. It also rarely drops runite ore. Greater demons also drop rune items: they are found at the demonic ruins and in the Wilderness Volcano.For more info check out the RuneScape wikia website.
Some you can buy at the RC Guild when you have level 50 RC, or you can kill abyssal monsters and they drop them as random drops.