Price varies by group size
Meet your guide outside the Cobra Cafe by the toilet/parking entrance on the north side of the building facing the Rijksmuseum. (between the bicycle lane and the Cobra Cafe)
You can cancel up to 24 hours in advance of the experience for a full refund.
I recommend the guided tour, it will make a good memory.
The Museum shop too has merchandise that is worth purchasing, catering to all age groups and budgets.