Lego has discontinued their Bionicles series and just launched the new Hero Factory sets, but it's not too late to find great deals on the discontinued sets. Right now on the Lego store's sales section they have 8 Bionicle sets, each 50% off, including four of the really cool large sets.
If you're a Lego fan it is a good idea to bookmark the sales page and check frequently. A few times a year they put discontinued sets like these up for sale and they often sell out quickly. This is also a good time to check out some of the stores to see what Lego sales they are having to clear the old sets off the shelves prior to the Christmas season.