One of the most popular antique price guides is Kovels.com. The site offers pricing on a wide variety of antiques and collectibles, and also offers copies of their printed price guide books for sale, as of 2015. In general, finding the best antique price guides often depends on the category of antiques being researched.
If it is necessary to get an exact value of an antique, many online appraisal services can look at photographs and details of the antique to determine the value of the item. In most cases, however, these appraisers do charge a fee for their services.
Though many category-specific guides exist online and in print, it is important to check how often they are updated or published. One of the major problems with printed antique guides, in particular, is that the price of antiques often fluctuates. One research tool to use when estimating the current value of antiques is eBay. However, if using this resource, it's important to note that the value of the items listed is generally significantly lower than what a local antique store would sell the same thing for.