20 grand or less. You may qualify for a free one based on need and income. Depends on source. You could a fund raiser ( go fund me) . Private training cost less. ( find a trainer). I don't advocate self training. Agency dogs, private trained dogs, self trained dogs. As a warning', faking a service dog is punishable by federal fine and jail time. Also state penalties and fines.
Seeing eye dog is another ball game. I would put them at the pinnacle of Service dogs. They are agency dogs with a huge responsibility. And huge standards.

Need a dog for the blind check the PAWS progr

Check with the epilepsy foundation of America

Actually it is like having any other dog for me because any we raised as a kid you had guidelines to follow for show & fieldtyel.

Labs are great my husband had one and she could tell before I could.