A little play, like 1/16" is completely ok. Surveyors flag these all the time and replacement is not necessary.
The cost to replace bearing will likely be higher on that boat as rudder may need to be dropped to pull shaft. It is something I would schedule for a normal maintenance haulout, no need to panic and rush a change. Even if play is 1/8".
In the yard, I'd figure $1k wild guess.
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