We told the kids that they have to complete 4 jobs a day in order to receive a quarter per day.
Their jobs are things like: cleaning their rooms, picking up dirty clothes, setting and clearing the table, making their beds and sweeping.
Laney has gotten a quarter every day since we have started. Gavin is not quiet as diligent and has found a way to be a little more sneaky about it. 
Yesterday Gavin picked up his toys before quiet time, made his bed, picked up his dirty clothes, and cleared the table.
After realizing that he had already completed 4 jobs he decided to not clean up his room before bed.
So Laney did it, all by herself while Gavin read a book.
Sneaky sneaky.
The other day the kids got to take their money to Target to buy a toy. We counted out their quarters, paid tithing, and then put their quarters in a baggie to take to the store. 
I am not sure what Laney was more excited about. Buying a toy or being able to give her money "to the Prophet so he can give it to Jesus."
We have explained many times that she will not be able to give her money to the Prophet that she will just give it to the Bishop. She has told me that "I will give my money to the Prophet and then Heavenly Father will come down and get it."
It's a work in progress.