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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 Careen - Melee Guidance - Melee Doughty
Melee Fortification - Melee Afflictions - Melee Retaliation
Melee Careen - Melee Guidance - Melee Doughty
Melee Fortification - Melee Afflictions - Melee Retaliation