Usually costs around $10.  Cost goes towards buying a ball if you choose to do so.  They will have 6-8 balls from their current lineup, all should be 15# with a stacked drilling.  A variety of predrilled spans are available.  They have changeable inserts to fit your hand.  You won't be able to change pitches, but you can't have everything.  You get about an hour to try everything.  Staff will be on hand to help changing inserts or balls.  They also provide tape to fine tune the fit.  I didn't care for anything enough to purchase, but the Challenge was well worth the money.
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Penn State Proud