You can buy the last wish in paperback on amazon. I think the box set of Blood of elves time of contempt and Baptism of fire are all the same. I do not think they sell Blood of elves in normal paperback by itslef.
I enjoyed the first book. I thought I had the second, but I guess I never bought. I think the only option for Blood of Elves is Mass Market Paperback or bundled with the set. Unless you want an older paperback print. Since I'm trying to avoid hoarding books, I generally look for the cheapest reading copies I can get. :T
You know what they are a little worn down which I just noticed. I don't know how that happen since its been on a shelf since I gotten them. The corners are worn down a bit, and the side cover on one of them is fading a bit. They aren't in bad shape but not sure if its worth selling now that I've taken a look. I can take pictures if you want still.