Charmaine,
It would help us to help you better if we have an idea how much you already know.
Generally, the common aquatic plants are cheap. Most cost around $1 to $1.50 a pot. But green thumbs or not, you won't be able to keep them alive, much less grow them, if you don't have the right equipment.
You have to tell us more before we can help you. But even before you do that, you should do some research yourself first. The information is freely available all over the internet so please read up as much as you can before you ask furthur questions.
A good place to start would be:
http://www.thekrib.com/Plants/
Loh K L
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