The Amazon one there is the first trade it has issues 1-7 in it. The omnibus has 1-25 and some other stuff. It is about 5 trades worth of content if I remember right. Just to give you an idea. So 45 dollars would be a good price I think.
The trades go for around 10-12 dollars, I believe. You'd have to look them all up and crunch the actually numbers to be sure.