I had an aussie that looked purebred but got him from the shelter. The chances of that ever happing again are slim to none. But I agree with you...one of the best dogs I've ever had. They do shed though so you have to love to vacuum and brush her/him. And they get a winter undercoat.
But with that said, the price doesn't matter if you have the money, because the years of warmth, loyalty, and sheer pleasure are worth it. SeaBreeze is right. The sellers and shelters spend a lot in vet bills before they offer them for adoption....daily care, shots, microchips, spaying, fixing, etc costs a lot from the Vets these days.
I want another dog! Bella needs a friend. I'm meeting with fencing people this week.
Some pets are not all that warm, loyal, and pleasurable so one must choose wisely. I walk them. If they walk me then, no. I look them in their eyes and must have a connection.
Getting one that is already house trained is a plus but Bella wasn't. She took about 18 months to get there so my house has been puppy-proofed for quite awhile (rolled up the carpet and covered the couch). Routine and consistency is key. Australian Shepherd dogs need to run. Frisbee playtime works well if you're not a runner.