FEATURES
1. Sell only specified items by using the RPGMaker shop processing list and flipping a switch.
2. Set the selling rate of the items using a variable (so you can change any time in game).
3. Notetag armors, weapons and actors with bonuses or penalties to this selling rate.
4. Selling rate appears in the pawn shop scene and changes colors – to green if party has a bonus to the default or red if they are at a penalty.
5. Normal shop functionality remains the same while the switch is off.
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Galv's RPG Maker Scripts & Plugins 
You’re awesome MATE! :D thanks a bunch for sharing your script!!
Is it possible to have a skill that gives bonuses or penalties to the selling rate? Like a passive skill that do the trick.
Not possible with this script, but possible to do with scripting knowledge. I can’t do requests at the moment, though, sorry
Hi!! I’ve got a question about th script. How the SWAP_SWITCH is activated/deactivated? I’m triying to do but so far, I can only activate the switch and can’t deactivate then.
The SWAP_SWITCH refers to a number that you use in-game event command “Control Switches” to turn on or off.
Sorry to answer this so late. Thank you for your help.