Installation:

Extract the ZIP to your SPT-AKI installation folder.

To fix hover tooltip not refreshing when an item's price or interested traders have changed while the item's inspection window is still open, use the "Item Attribute Fix" companion mod.

Description:

A client-side mod that uses the game's built-in methods to show the highest selling price offer from traders, exactly as displayed in the selling UI.
Hovering over the attribute will reveal available offers from all traders who can buy this item, sorted from highest to lowest.
This can be highly "educational" for the purpose of learning the value of items within Tarkov.
This mod is very easy to update as it gets all of the content from the game itself (list of traders, currency rates, currency symbols, etc.)

Note: Flea market prices are not included intentionally, because they are ridiculous and completely break the balance and any kind of challenge in getting rich, due to how likely you are to sell a useless item for a meme price in SPT.
Example: "Molot AKM-type gas tube" is over ₽350,000 on SPT's flea market. In EFT, no one will actually buy this, but due to how flea market works in SPT, you are very likely to successfully sell it. This is a poorly thought-out feature and I rather pretend it didn't exist (at least for selling purposes).

Due to using the game's built-in methods, this mod is dynamic:

It is container content aware:

It is condition aware:

And, of course, durability and currency rates aware:

And also stack count aware: