Do the math.
The answer equals 343
If you want a 7x7x7 there is only one place to go, http://www.v-cubes.com/ they are the only 6x6x6 and 7x7x7 cubes in the world and they are extremly expencive + a lot of shipping. the 7x7x7 is called a v cube 7
7x7x7 = 343
343. In-head calculation.
5x5x5 gives us 125 7x7x7 gives us 343 343/125 is 2.744
You can get them at V-Cubes.com