First I'd like to say great job on the spreadsheet. You definitely took a lot of time and effort and I find it very usable.
I would like to make a suggestion if possible. Is there any way that you could put the items into a separate worksheet so that we might be able to add items as they come out. Unless I'm misreading the spreadsheet I can not find a way to simply update an item or add a new item.
As I said before great job and this is only a suggestion.