I know nothing of Bionicle, but I'm fairly certain this is a really nice flip at the low asking price. No instructions or set #'s available, and I've only identified 2 of them. Any help would be appreciated - if interested in the lot for yourself, feel free to PM me and maybe we can both make a score...

I moved your post into it's own topic.. you might get more help this way. Is this the best picture you have? And which two have you identified?

They shouldn't be too difficult to identify, find an unusual part or a part in an unusual colour & find the Lego part number stamped on it, then go to the bricklink catalogue & search for the part number & you should be able to find the set pretty quickly by process of elimination with any sets that included that part etc.

Used Bionicles & Hero Factory are generally obtainable for about $1.50-$2 each, maybe up to $5 for the really large elaborate ones.

check the part numbers on the weapons, that will get you closest fastest.