They have the option of a time limit. I believe for 1 hour it is 15-20 dollars. This is the best option as you get unlimited plays and tickets during the hour you pay for. They have shorter options of 30 and 45 minutes also. All games cost 1 point at chucky cheese which is great! I take my 3 boys there and they share a 1 hour card and have plenty of fun.
I would plan for $10 to $20 a person. You purchase points that go on a card then each game deducts the points from the card as you play. I'm guessing .$.50 a credit but the math varies. Look for coupons online.
Each game takes different credits from a debit card you purchase there. It averages about $10-15 per hour of playing.
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