How to find mon'tregul's grasp ?

On what map level can I find one ? I really want it. Also what is the going price for this item?
10-15 exalts I believe.
IGN: Caessa_Undying - 4 FPS Immersive Rain 4 Lyfe!

Shop: http://www.pathofexile.com/forum/view-thread/822740
http://pathofexile.gamepedia.com/Mon%27tregul%27s_Grasp

level 75+ or a chance orb, if the wiki is correct.

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