I wouldn't be a cheapskate if I were you.
You're spending so much money on your flying anyway, why not spend a fraction of that on a 2nd hand aviation database Pilot III, and be safe.
Let's face it, GPS's are not just navigational aides, they're a serious enhancement to Air Safety. They reduce cockpit workload dramatically. I wish people would stop frowning on GPS's as the bad brother of good old "dead reckoning".
There are 3 main purchases that one will encounter in one's life, buying the house, the car, and the GPS. If you're serious about your flying, don't cut corners.