$60 for all four mounts? That sounds fishy and very low quality.
You'd be about $400 for OEM mounts for reference. If we presume your mechanic is using OEM mounts, $300 in labor to replace them isn't that bad.
Two of the four mounts you could change yourself with ease; front and passenger side. The third, the air intake/air filter housing needs to get removed to access it, but is still straightforward The fourth mount, the rear one, is a PITA to get to.
https://parts.conicellitoyotaofconshoho ... ne--mounts