Another spot to grab bottles is from wine stores that are just finishing with a wine tasting. The ones that I have dealt with have been more than happy to not have to take the bottles back to the trash/recycling. And then, one of the more entertaining methods would be to buy a couple cases of a nice chardonnay and work at emptying the bottles with some friends. I'm sure there are many people on this forum that would volunteer for a task like that.
Do note that some chardonnay and pinot bottles, being of a similar shape, don't like to fit in conventional racks and may not stack as well.
- Jim