were do you find megalixers?

i found 3 in the whole game
is their any momster you can steal it frim?

if you view all of the turtle's paradise posters, you can get a megalixer plus aload of different sources! You can find the locations for the posters on a FAQ somewhere. Hope you find this useful. :)

on my save "closest to sephiroth" i have 99 mega elixers due to the
W-item materia

what you do is this have it equiped and find some where that the monster cant possibly kill you like near midgar.
1. get into fight
2. go down to the use w-item command thats replaced the item command
3. find item to make more of
4. use that item on any char then chose another like a poition
5. then press select then cancel and the item you chose first like mega elixer will increse buy one
6.keep on selecting and caneling the other item untill you have the desired amount

There are more than three, but with the W-Item trick, you can have a limitless supply. I'd dig through my FF7 guide and my brain to find out where all the megalixirs are found, if I weren't lazy and my guide wasn't lent out.