[NilayK]

I have to disagree with that.

While I'm not saying this might be true for every book out there, but I completed most of my bachelor's and my master's engineering degree by buying low priced edition from India and SE Asia and I used to verify and compare with US editions and never once did I find any major differences in context or additional problem sets.

The quality of paper wasn't as good, but the price difference was huge and well worth the effort for me to be able to afford them.