Though I know that with how vast imagination can take this question, the most common answer would be "ask the DM", though I am looking for common items that should be listed somewhere...
Specifically, I am searching for the price of tripwire and wood. Though these two items are mentioned a lot in XGE and the PHB, there's no mention of their cost as raw materials.
Tripwire is one of the most common ingredients I can find in trap making, yet the closest comparison is a 50-foot rope which has enough tensile strength to suggest that it's made of multiple tripwires woven together. As for traps, the only one mentioned is the Hunter's Trap, which is described as a bear trap.
Wood is missing among the trade goods list, although metals, many plants, spices, and livestock are all mentioned, making the evaluation of how much wood is needed to create anything hard to calculate.
In my search for these prices, I will admit that I have convinced myself that I must be missing a book that elaborates on such mundane item prices to help DMs out to avoid player complaints and inconsistencies. Thus, I thought that asking for this resource might be more beneficial in the long run.