How to Get Them from the World's Top Auction Houses & Appraisers
Following websites provide free research and auction estimates for many rare art, antique, and collectible items from the Worlds Leading Auction Houses.
eBay's Completed Items: Search the eBay database (free with registration) and see final sales price(s) of any item sold in the last 2 weeks. This can give you a general sense of the value of many items.
Sotheby's Free Research Tools & Auction Estimates: Sotheby's site is a great resource for researching rare art, antiques, and collectible items. They provide past sales results (free) on their website and offer free estimates for items they typically sell at their auctions.
Christie's Free Auction Estimates: Christie's also provides free auction estimates for items of the type and value typically sold at Christie's. Things like fine art, rare antiques and highly collectible items.