The rights don't expire for at least a couple more years if I remember correctly. But to be honest, I wouldn't want to self publish, just because as far as scholastic books go you don't get much credit if you do. I could make more money if I charged people directly, but to me being reputable is more important than making money. If I was writing fiction it would be different. I also wouldn't be able to set the price much lower either, other than maybe six or seven dollars, just because the price you see on Amazon is practically at cost because there are so many hundreds of pages. When the rights expire the only reason I'd leave my publisher is to bring it to a bigger one with better distribution, but I like the company I'm with and they've been pretty good to me. They're a new company and they have lots of room to grow. So hopefully by the time the new edition is out the digital version will be sorted out. Personally, I don't care much for ebooks and don't think it's the way a book ought to be read, but to each their own.