Anyone know where you can download ready made hdr imagery? I have not the equiptment, nor the motivation to create my own :)

Also, I planned on rendering with mental ray. But I have been reading and it seems like it would be more direct and effecient to work in lightwave. I havent learned anything about lightwave yet, and I have got a pretty good handle with maya, but I'd be willing to switch if its worth it. What do you think?