One more thought, Kimberly, given that he likes Fred--I read on another board that Stan Schmidt is writing another book to slide in between Decimals and Algebra--maybe it will be done in time for you? You could always email him and see how far along it is--he's very approachable.
Thank you for the heads up, Minnie! I emailed Stan and he confirmed that there is another book coming, probably by the end of summer. It's one of 3 pre-algebra books he's planning, all from different angles (Biology, Economics and Physics). I think that might help us hold off Algebra for quite a while!