As my experience level in Fallout 3 gets higher, I want to hunt a lot more deathclaws. Is there a part of the map that is just lousy with deathclaws?
The deathclaws in the sanctuary do not respawn. You must complete waters of life to get more than 1-2 to spawn near the exterior entrance.
Old Olney and the area near the alien crash site/power station are dependable locations prior to completing the quest. A one time spawn of 4-5 will also occur near the raid shack/bethesda ruins before becoming randomized creatures.