Call me cheap but for the past 15 years I have been able to save a fortune on shower gel.
I have a friend who is a chemist and assures me that the recipe they use for shower products is essentially the same as creme bath(bubble bath).
I originally bought a pump action shower gel container and have, for the past 15 years, replenished it with creme bath at about a fifth of the cost.
And if you are worried about your skin - I have sensitive skin and have never has any ill effects.