In the OhmArt book order I just received (quality checking – both versions are good; the hardback is great), the bookmakers Blurb included a $10 off shipping code. Use the promo code: CHEERS to get this. I see no reason why this shouldn’t work for the 75,983 people waiting to get their copy.
My shipping was $12.50 and I live just north of Antarctica, so I think US and UK citizens should do even better.
Links to books: here.