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.
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Greater demons drop Rune Full Helms and Rune KitesLesser demons drop Rune Med Helms (Rune Helms)Cockroaches drop Rune Square Shields and Scimitars
Fire Giant's tend to occasionally drop Rune Battle axes.
The level 83 cockroach soldiers drop them on occasions in runescape, for nonmembers and members.
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.
yes. sell things in G.E. kill monsters lend rune weapons. (if you have bought one).