How about Magnesium ascorbate? Plus you missed magnesium glycinate which you can get a good deal on at Swanson’s. Chelated in the best way and won’t give you the runs
http://www.swansonvitamins.com/swanson-ultra-albion-chelated-magnesium-glycinate-133-mg-180-caps
Oh yeah! I forgot ascorbate, and I forgot about Swansons too. Thanks!