a little over 100 locations altogether, limited and sleeks combined, is probably much closer to the truth.
A list with 70 locations is more than enough to have a/b/s permanently on hand. If you're seriously having trouble with one of the wands, then ask some friends to show you limited ones with the same property.
I don't like the sleek system, because it heavily favors cheating, because its entirely random with a huge effect on the power of a character, and because it involves a lot of zero-fun drudgework where you go back over the same old already-explored locations time after time with every character to check for the possibility of your sleeks spawning there.
That being said, if you already have 70 locations down, you really, REALLY don't need to learn any more, you've probably got most of them already.