Hello, does the D2JSP website have an up-to-date item price list, or any that could be helpful as a new player after a long break?
Please help. I apologize for the inconvenience.

There is not. You would have to post a price check in the corresponding trade forum in question. Especially with a ladder reset, prices are constantly changing at the moment.

Thank you for your reply. So I won't be able to find such an old person so I can even give some guidance?

You could ask experienced players for their opinion about certain items or make a price check topic. Also you can use search function to search specific items to see what others sold that item for.

Your best bet would be to do price check or what Mafkees stated in post #4 by asking experienced traders in the section you are referring to or using the search bar to look up items of like kind/quality for reference.

Hope this helps!