No offence but you asked where you could buy them. I simply pointed at a point where you could do just that. I am of course not aware of your state of wealth. But hey 3dgs costs even more so you could cough up $20 for a book right. Or just search the internet. Enough tutorials about HLSL :
http://www.pieterg.com/Tutorials/water.phpThis one is openGL, but you could use it for the required technique
http://www.bonzaisoftware.com/water_tut.htmlor look at NVidia's ocean shader on how they did it.
