Financial Literacy with junior highers

I am actually excited to be adding a unit on financial literacy this spring in my 8th grade. This is a topic I am passionate about and I think will be very helpful for my students.  The first thing that comes to mind is trying to create a simulation for the students.  They can earn money by turning in assignments on time, having all their materials, answering questions, whatever.  They spend that money when they have a late assignment or forget something.  If they go into debt, maybe they'll have to vacuum my room or wipe down my tables to pay off that debt.  They can save their money to buy certain items that are priced at different points.  Obviously this won't be real money.  Perhaps they could purchase some extra credit, a pack of gum, getting to sit in my papasan chair for a week, things like that.  This would obviously need some tweaking, but I think it would be a fun way to help the kids learn about budgeting, saving, and spending.  I have a very small class, so I think it would work pretty well.  Any suggestions people might have for improving this idea would be welcome!

I have two units I use with basically the same premise. They build a town, purchase their building materials, pay day care, choose their jobs, get paid, and draw situation cards that cost them money or give them money. The books are Our Town A Simulation of Contemporary Community Issues by Katherine Ruggieri-Vande Putte and Create a City A Complete Framework for Students to Use in Creating an Original City by Charlotte Jaffe and Barbara Doherty  I hope these help.