Great question, Marc! I have three kids (ages 5, 10 & 12), so I can attest to how hard it can be to teach sound economic principles in today's credit-based world.
Wonderopolis offers a couple of Wonders of the Day that some parents and teachers might find useful when teaching the power of savings and the difference between debit and credit cards:
Marc, I realize you specifically mentioned credit cards related to money management, but I came across a fun video cartoon that explains The Difference Between Stocks and Bonds. It's a great way to introduce these economic concepts to students.
Here are a few other resources dealing with this subject:
The Stock Market Matrix is a color-coded chart that shows the rate of return on investments based on the year money was invested and year it was withdrawn.
Plant Orange provides a game format for students to go through a series of missions to gain money by investing or spend money they gain to match their budgets and reach their goals. The website is free but requires that kids enter a parent's email address so to use it in a classroom, the teacher would have to contact parents.
There is also an interesting, informative infographic on The Lifespan of a Dollar Bill provided by CreditLoan.com. It shows flow charts of the production, distribution, and eventual removal from circulation of currency as well as statistics about the quantity of dollar bills produced every year.