What is the value of a Thompson 44 caliber contender?

Contenders have a huge value range due to the unlimited number of options available, determining factors are barrel length, finish and material. Frame type (2 old style versions and the G2) frame material (stainless, blued, high luster blue) extras such as scopes, sights, fluted barrels custom grips, etc. To get a good value I would go to the gunbroker.com website (there is a category for contenders) and compare what you have to what is there, you should be able to get a good value for it there.