Terrific game - no price for in-app purchases

Fun game. Recommended for all. Completed all of the levels that came with the game so I went to purchase more. There is no pricing info. Got all the way to "enter your Apple password" and still did not know how much it would cost so I cancelled the order. For all I knew the Combo pack was going to cost $100. Had to wait until I could check on the app store. Still not sure if the prices shown here are binding. Why wouldnt the app tell me how much I am agreeing to spend before I make the purchase?

Iggy8702 about Auralux