I've searched the internet and I found some articles and people talking about prices around $11-16k, most of the times including labor.

https://teslamotorsclub.com/tmc/threads/new-battery-cost-for...

https://www.reddit.com/r/TeslaLounge/comments/183if34/what_i...

https://www.reddit.com/r/TeslaModel3/comments/1blczt1/what_a...

https://www.recurrentauto.com/research/tesla-battery-replace...

https://www.findmyelectric.com/blog/tesla-model-3-battery-re...