Try looking around local toy stores, such as Toyland, Toys R Us, and FAO Schwartz. Try Walmarts, Targets, Stop & Shops, and other stores that have toy sections. Check Amazon and eBay to see if there are any on sale. If all else fails, then try to call the company that sells 3 by 3 rubik's cubes, see if they sell any 4 by 4 rubik's cubes, and see where you can pick some up.
[Assuming location is in North America]
Best option is online at sites such as speedcubeshop and related.
You can probably find 4x4s at Walmart too, but they're usually really hard to turn.
You can by them at toysrus or barnes&noble. Hope it help! :>
On a 3x3 there are 9, 4x4 there are 16 and so on. Basically whatever number of squares on one row going across times that number.
http://www.cubelagoon.com/?ref=1285 Basically, you answer surveys to gain points and then use those points to claim prizes. Such as a rubiks cube. Its 100% free. I've gotten a 3x3 white cube and a 4x4 rubiks cube from here. Its very fast. For a 2x2 cube, its 4.75 points and each survey is around 0.5-2 points. So you can get it in no time. Just use that link and sign up and start answering surveys.
I bought mine off the rubik's cube website
The 4x4 rubik's cube or the Rubik's Revenge
i dont think you can
They cost about 10 dollars. Or completely free from http://www.cubelagoon.com/?ref=1285 Basically, you answer surveys to gain points and then use those points to claim prizes. Such as a rubiks cube. Its 100% free. I've gotten a 3x3 white cube and a 4x4 rubiks cube from here. Its very fast.
Thecubicle.us and several other websites (including Amazon) offer 4x4 Rubik's cubes.
you can get it on flipkart , rubiks.com or on ebay
there are actually six, the original 3x3 cube, the 30th anniversary wood cube, the ice cube(clear 2x2 cube), the plain 2x2 cube, the 4x4 cube, and last but not least the 5x5 cube.
The best choice is Rubik's. Don't get a knock-off. You can buy a reliable 4x4 Rubik's Cube online at the website in the sources and related links(below).
Why are you even thinking to ask that question?
This skills that someone has to solve a Rubik's cube can be used on any size Rubik's cube, whether it be a 2x2 or a 5x5.