It depends on:
What builds are meta this season?
How much time has left for the season?
Keep in mind that an item like this one solve, by itself, 2 things: max res and pr. Max Res is the most valuable stats in the game imo. But, you can get to 81 with charms, 82 with laz trophy. Tyrones helps when you have to overcap max res also. If you want it for your lab merc it is, probably, the best option.
For me it comes to: if you can itemize around this and get a better dps outcome, since it covers most of the defensive stats, go for it.
If you can't it's not that valuable. So I would say at least 1k but it can get to 4k depending on how many people want it and how much they are willing to spend to have it.