WINTERLX'S PROFILE

I have recently started working on a project involving the dynamic sale and purchase of items in the game world.

Basically, my objective is to have a mini-economy based on regions, and in-game events (I thought about including scarcity, but it started becoming a little hard to get a model together.)

My only issue is the shop processing portion.
As you all know, prices in RPG MAKER are preset and can't really be modified in-game. Truly, I would just want to replace all my prices by variables, which would make them easily manipulated with dynamic events and locations, but have yet to find a solution.
I lack programming experience, so I wouldn't know what to modify, or how to modify the scripts and replace the <price> parameter which had a set number by a variable.
I thought about creating an artificial menu, where all the possible in-game items are shown and can be selected to be sold, but it felt wrong, and I believe it would be both annoying for me to create, and for the player to use.
I was wondering if anyone had any experience with creating games with variables as prices, or knew how to do it.

Luckily, I can still work on most of the game without having any actual functioning shops, but it will be a key feature, if I ever get it working. I have been building models for the change in price in the different region along with the different process that can be done on items. It really looks neat and even without that, the game based on trading could turn pretty fun solely using the special trade opportunities (not processed through shop, but given in the shape of a quest).

Well that's where I'm at. If anyone had any suggestions, questions, or comments, I would be very happy for any feedback.
I'm also very new to this community, so I apologies if I forgot something in writing this post.