What lens are you using in these shots, looks great.
It's a Peleng Fisheye, mounted to a Canon Rebel t2i. Its about the cheapest way into an 8mm fisheye, anywhere from $200 to $350 or so. You can google "Peleng" or search for them on ebay.
By the way, it's a "manual" lens. It does not autofocus, and you have to manually set exposure. At first its a bit tricky, especially the focus by distance stuff, but you get the hang of it very quickly.