Modding the price of things (How do I do it?)

[Killer Kitten]

Hey, I've decided to mod the game to make the price of stone arrows enough to purchase two perches. But where do I go to mod that?

[Philtre]

I believe prices, as well as other basic item properties, are stored in CONSTANT.OBJ (found within the individual save folder), but this is not a plain-text file so editing it may not be straightforward. However, since it is part of the save folder rather than the game source code, you can just copy the folder for editing purposes and restore the original if you bork something.