Some time ago I looked at
ebay for a few of these I had - as I recall there might have been a little premium for the 1944 and 1945 years but otherwise face was about all they sold for on
ebay. Remember to look at
ebay completed listings and not open listings. Completed shows what actual sales occurred at. But sometimes it's how you write it up on
ebay also to garner interest. There are a few individual stamps that might get more than face-value interest if you want to go that route.