There's no such thing as a goldador, it's a lab/retriever cross. They have been around for decades and I also have one as a guide dog and have had one previous to that who was a guide dog, who was incidentally withdrawn due to negative dog distraction. They're lovely dogs, intelligent and trainable but from my experience of both mine and various other guide dogs, they can be very stubborn and/or highly strung, so you need to keep on top of them training wise.
You could attempt to rehome one from Guide dogs however their criteria are now incredibly strict: you would not be allowed to rehome if:
You are out of the house for more than four hours in a 24 hour period.
If you plan to take the dog to work
If you plan to get a dog walker or leave the dog with anyone other than the members of the household.
Tbh some of the rehoming criteria are incredibly harsh and IMO bordering on the organisation actually not wanting to rehome, in fact they put emphasis on expectation that the owner will find a home for the dog and rehoming is a last resort if this isn't possible. There are very few puppies who come up for rehoming as these are generally offered to other organisations (hearing dogs, dogs for the disabled, the police) first, and the majority end up going back to their puppy walkers. So if you wanted a guide dog you would likely get a retired one who would be about nine years old, or a withdrawn one who would be likely to have either health or behavioural issues.