How much soap money does a shower cost you?
Let's say you spend $3.00 on a bar of soap and it lasts for 7 days of showers. That's $.43 per shower. 
For your next bar of soap, you spend $10.00. That seems like a lot of money, except it lasts for 8 weeks or 56 showers. That's $.15 cents per shower. F.Y.I.: One bar lasts me and Andy 6 weeks of daily showers ( 1 shower a day for each of us) - 84 showers That's $.12 per shower.
Good soap is cost effective.