#1
Ok so, I'm getting a thinline (semi acoustic) tele, and i'm wondering whether I should put a bigsby on it.
First of all, i'm poor, and useless, so

1. Where can I get a cheap copy?
2.How hard are they to install?

Also

3.Do bigsbys ruin sustain, increase sustain, or have no effect?
4.What do they do to the telecaster sound?
#2
1. There are "licensed" bigsbys, I'm not sure of the quality, I think you can find them on allparts.
2. They're pretty easy to install: http://www.youtube.com/watch?v=23DH-uFn6A8
You might want to get a roller bridge, which will help it stay in tune.
3&4, I don't have one on a tele, so I'm not sure.