For those of you who want to build the robots in Jim's book The Mayan Adventure but only have an Education NXT Kit, keep an eye on LEGO Education's website. Apparently they're going to be selling a "Mayan Adventure Parts Pack" which will include all the extra pieces needed to build the robots in The Mayan Adventure with just the Education NXT Kit. It's expected to sell for only $7.00 plus shipping.
Even for those of you who already have the neccessary pieces, this pack may be useful in other ways. Many people have noted how useful Hassenpins are and how hard they are to get - these things are selling for $5.00 a piece on Bricklink! In this Mayan Adventure Parts Pack, however, quite a few hassenpins are supposed to be included (the source thought it might've been six, but isn't sure). So this might turn out to be a good way to simply get more hassenpins if you really need them - 7 bucks isn't a bad deal.