Should I get a bike helmet?

Amazon.com and Coinstar (those coin things at the grocery stores) are teaming up to offer people gift certificates for their coins. When you cash in your coins, they take out an 8.2% (?) fee per dollar. You now have the option to either do that or get a gift certificate for Amazon.com. The latter doesn't take the service fee.

They made it because they noticed that only 11% of teenagers have credit cards. So it's kind of good, but it's all about getting money from everyone possible.