Read the article I linked. It is excellent and will answer many of your questions. 
One of the most highly recommended incubator that many use here on BYC is the NurtureRight 360, which costs about $150.
TSC and Amazon usually have it.
There are both more expensive and less expensive ones out there. You would need to read up on the pros and cons of each and make your decision.
I have the 360, which has worked great for me, but I also have Brinsea, which costs a bit more.

One of the most highly recommended incubator that many use here on BYC is the NurtureRight 360, which costs about $150.
TSC and Amazon usually have it.
There are both more expensive and less expensive ones out there. You would need to read up on the pros and cons of each and make your decision.
I have the 360, which has worked great for me, but I also have Brinsea, which costs a bit more.