Are implant prices different at each dental clinic?

Are implant prices different at each dental clinic?

Someone in my family needs an implant, and I heard that the prices vary depending on the dental clinic.

Is it because the insurance doesn't cover it, resulting in a different price? When I go to the dentist, I often end up paying more than I expected for the treatment.

When considering implants and choosing a dental clinic, what criteria should I use to determine if the implant was done well? I'm curious.

Is there a period during which implant issues are treated for free, similar to after-sales service (A/S) for implants?

Since it's my first time with an implant, I'm curious about everything.