I have grown pineapples. Sprouting from another top is very easy, just make sure you peel off a good amount of the lower leaves which will expose the new "roots-to-be".
For whatever it's worth, I don't really recommend growing pineapple unless you have some extra space you're just looking to fill. It takes over a year to produce a single fruit, and then it needs to be replaced, since it will only fruit once. There's a lot more productive fruits/vegetables that can be grown in the space.
Here's some places you can order the plants:
Google