Oh, veerie, where do you live? I grew up in MA, and lived in N. Conway NH for a number of years. Of course, I'm in the real "north country" now.
I've never had Greek yogurt, but I have strained regular yogurt and gotten the thick stuff. If you use good yogurt to start with, it's fantastic strained! I just line a strainer with a coffee filter and dump in the yogurt. I keep it in the fridge, and it's ready after several hours, though truthfully, I usually leave it overnight.