LEGO Harry Potter Aragog in the Dark Forest 4727

Pros: Cool giant spider! A web trap that works, and a tree that hides an owl.
Cons: none

Overview
This 178-piece LEGO set, Harry Potter: Aragog in the Dark Forest, model number 4727, features a giant lego spider (you put it together), a tree with a secret hiding spot, and a web trap on a small green baseplate.

...

Pros: Lots of spiders!
Cons: Original price is quite expensive ($19.99)

This lego set feature two Lego Harry Potter Minifigs - Harry and Ron, plus lots of Spiders... There is the giant black widow type seen on the box, couple smalls ones (approximately the size of a dime), and lego tiles printed with spiders. You (or your kids) sure will have a lot of fun with it. The set contains 178 pieces and consists of three main components: a tree, a giant spider, and a trap which has spider webs collasping onto Ron with a pull of the string.