Pay the admission fee and that is all! Pay nothing more for the experience (excluding food & drinks and personal massage and facials)
Check out Groupon before you go. They usually have highly discounted prices. Also call the spy and make sure that all their pools and saunas are working. They go under construction a lot
Tickets are $40 on weekdays and $50 on weekends unless you have a coupon. Admission buys a single person access to all saunas and pools, as well as a hot bath area (separated by male and female genders) for 25 hours. You should inquire about a group rate if you intend to go in a large group.
Call them and ask.
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