https://wiki.project1999.com/Cobalt_Drake_Cloak
Looks like they go for around 1k, and add some str and a little mana compared to a molten cloak. Bout the only one that comes to mind between ~100 and ~15k.
Or if you want a never-ending grind quest for a no-drop cloak:
https://wiki.project1999.com/Grayder%27s_Cloak
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Djynni Biqasmalyani - 60 Human Wizard
Mandak Battlebeard - 60 Dwarf Paladin
Maeghar Frightreaver - 56 Erudite Cleric
Maamdak Battlebeard - 48 Dwarf Rogue
Crunkasaurus Rex - 49 Ogre Shaman
Mendak - 51 Halfling Druid (Green)
<Paradox> RIP