The Hooked On Hallmark website sells a value guide and inventory software that can be used to value all Hallmark ornaments. The software is $45 as of 2015. Visitors use the website to gauge current prices of ornaments for possible resale on website like eBay.com.
There are several guides available on eBay.com for those looking to buy or sell Hallmark ornaments. Visitors use these to gauge the value of vintage ornaments. The forums on eBay are also a good place to locate collectors who can help determine an ornament's current value. For more concrete prices, Amazon.com sells Hallmark ornament value guides, including one that covers 1973 to 2006.