They have discounts on their website. I would suggest to go for $12.50 and get $5 Lego activity pack.
You also purchase a guide book it will give you a rare Lego for the kids is makes it a little bit funner for the kids thinking it was like five dollars. I would try to make it before 5
I would check on their website as well as RetailMeNot to find discounts. It shouldn't be more than $20 if you book ahead of time and use a discount code (there's one still available for buy one adult ticket, get a child free).
16.50/ticket on Groupon...
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