I am sure you know Awesome’s Magic Bundles. They consist of three books of one genre or by one author and cost only very little.
However, it would be even better if there were no duplicates in bundles. I understand that they are put together randomly and that they probably go by ISBN numbers or something but couldn’t they make sure somehow that they don’t throw two books with the same title into one bundle?
This spoils the fun of browsing quite a bit. But nevertheless they are worth a look! If you don’t care for particular editions and don’t mind used books the bundles are a great deal.