Secured cards can be helpful credit rebuilding tools for two reasons. First, because of the collateral, you can get them at a time when you're not likely to be approved for nonsecured cards. And as long as you maintain an on-time payment history, they can help you start to build a recent credit history that's fairly pristine.
Taking a shuttle or even paying for a taxi to a rental office that's a few miles away from the airport can mean a lower rate - 50 percent lower is common - for the same car, from the same company, for the same length of time. Many companies run free shuttles from some of the major airports.
I've never met a budget that I couldn't coax a few extra dollars from - and I'll bet that you can do the same. For instance, you're probably buying more minutes and more cable channels than you use. Oh, and how many black skinny jeans do I count in your closet? You have enough money, just the wrong priorities.