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Melee Prowess: Drop sources, locations, and probabilities
Mobs Dropping Melee Prowess
Melee Prowess can be dropped by most ennemies in Warframe. You should probably consider this as your primary farm source.
Other items:
Melee Guidance - Melee Fortification - Melee Careen
Melee Animosity - Melee Vortex - Melee Afflictions
Melee Guidance - Melee Fortification - Melee Careen
Melee Animosity - Melee Vortex - Melee Afflictions