The best way that I know of to establish a value is Ebay. Go to the category (collectibles, hardware tools and locks, tools). Click 'advanced search'. Enter key search word 'Spud Wrench' and then scroll down to click on 'completed auctions'. Scroll down to the 'Search' button. This will get you a list of recent sold and unsold items. Look the whole list over and ignore occasional high sell prices. Take an average. Look at the prices that didn't sell and that tells you what is too high. There are other categories to look in, especially for user tools, but the search is the same. Good Luck!