Orange still at lvl 160 lockpicking.
Coordinates I have for the ones I found of the cost of Desolace are:
40,17.1
37.4,20.0
36.2,22.5
37.3,24.1
36.9,24.5
35.9,24.9
33.4,24.2
Respawn times are about every ten mins, maybe every 15.
Bring Underwater breathing potion.