I know basically nothing about buying a trained dog.
But I looked at the Gatorlandk9 website
I also don't know what they want for those dogs. I'm not too sure I'd pay much money for a "trained" dog that requires a ball in his face for his heeling video, or one who is still being lured with food (and both kind of sloppy even at that)
Then I clicked on the video for Yawvor and found a dog creeping along waiting for a nasty correction and cowering when the guy reached toward it. I was not impressed with the dog being petted by the woman either. Dog looked tense, drew back, then tried to sniff the ground and avoid the people altogether.
If I were looking to drop 10k on a dog it sure wouldn't be here.
OP, if people who sell adult dogs are anything like people who sell horses, be very very careful who you buy your dog from.