The biggest Bionicle set is the Kardas Dragon, which you can
make by combining Axonn, Brutata and Vezon & Fenrakk.
New, slightly bigger bionicle is the large 2009 Mata Nui set,
clocking in just taller then Kardas.
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Craigslist is a GREAT place to look for these kinds of things. I
actually have Vezon and Kardas set for sale on
craigslist-Charleston, SC. Check it out!