The cheapest 445nm diodes I know of are
Here.
DTR is awesome, and all the diodes in my builds came from him, very fast shipping.
Just to let you know, IIRC, the lowest you can drive any of the 445nm is ~400mW. So it will be a big jump in power if driven even close to the "norm".
Congrats on first build! Definately try fluorescent and phosforesent stuff. And once you have your safety glasses, go around the house pointing at things. You might be surprised.
Try this: with safety glasses on, defocus it to a very wide beem, and shine it at a plant...
As for the wings, that's what normal with a G2 lens. If it bugs, you can get either a 3-element or acrylic lens, but output power will decrease.