It all comes down to "you get what you pay for", but the Belgard link shown above is the correct way to do a driveway. Sure, a walk-way is a lot easier, but that's why they call it a walk-way. If you drove a car too many times across the flag stone at your folk's place, well ... it would eventually be crushed stone.

Now for simply stabilizing a grass area for occasional parking, here's another thought:


Read more: Permeable Grass and Gravel Pavers Permeable Grass and Gravel Pavers
Flexible plastic paver mats are pre-assembled

Read more: EZ Roll Grass Pavers http://www.ndspro.com/permeable-pave...#ixzz1J94m7t4U

But no matter how you slice it, excavation (to us known as digging up a lotta' dirt) eventually becomes an issue.