We use real money 🙂 My kids are older (12 and 13), but we’ve been using money with them sine they were little.
We use an envelope system – they have an envelope for giving (tithe – 10 percent); saving (20 %) and spending (whatever is left over). This has worked tremendously for them because we do not buy our kids toys and things for the most part in between holidays. They get gifts at Christmas and their birthdays, and they get some small things at Easter. Other than that, if they want it, they buy it. Every once in a while we have the boys start to save for something big they really want – and make an extra envelope for it. They have to make choices about where their money goes.
As they’ve gotten older, we’ve increased the amount of money that the kids get and they’ve become responsible for more things. For example, we go to the beach every summer, and we go to another big event each year. Normally, we would give them money for that. We raised their allowance and made them responsible for setting aside that money. We pay for our oldest’s cell phone bill, and we are soon going to start adding what we pay into his allowance and make him responsible for paying it. If he doesn’t alot his money properly, he looses his cell phone until he can pay for it.
I do think that even at young ages that using money can work. If nothing else, our kids are in the habit of tithing and saving.