How much is a Liberty Head 1976 dollar worth?

Any 1976 US Dollar will have the dual-date of 1776-1976 and the portrait of President Eisenhower, not Miss Liberty. But, you may be referring to the Word "Liberty" which appears above the portrait. Any that have been circulated are pretty much worth a dollar although flea market dealers will sell them for $2 or even more. Several varieties were struck on 40% silver planchets as well as the annual proof and uncirculated sets and some of these may bring $20 or more if they are still in the original mint packaging.