Only the special exhibits and IMAX coat anything. The other exhibits are free, though they do ask for donations. And the special exhibits are very reasonably priced. I think I paid less than $15 for a terrific one on the science behind making the Pixar movies. There is also a $3 surcharge to reserve spaces at Endeavour and special exhibits in advance, and I highly recommend doing that because exhibits get popular and sell out fast!
Right now there is the bodies exhibit and there is an affordable fee for that as well as for imax.. All else that is part of science center is free. And there are a few other exhibits very near to the science center.
Endeavor is free. Check the website for IMAX and Body Worlds fee. The general Science Center is free.
I've been in science trip.. It's for free
I do not remember any fee or waiting in line except when we went to an IMax presentation there or next door.
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