Here you can find the The Witcher 2 Assassins of Kings Epic Weapons Locations, see below to locate the silver swords and steel sword that give over 32 damge for as low as 49 Orens.  You can see that there are only 3 epic weapons but just having any of those three will help you along your quest when you need to use it against the enemy.
The Witcher 2 Assassins of Kings Enhanced Edition TOC:
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The Witcher 2 Assassins of Kings Epic Weapons Locations
Steel swords
Silver swords
Ranged weapons
Additional weapons