The kicker in those packages is the MPS. $150 for the hub and a pulley.

If you don't need the MPS and will be happy with a 3.5 or 3.4 pulley you can get much cheaper on your own kit.

Look at the jump in price when you add in the wizair and DP.

On a side note
You still need a pulley puller to remove the stock pulley and you'll probably need new plug wires because chances are you'll break one or two removing the ones that are on the car now.