There are a lot of things to consider to determine value. Like John1 said you can
ebay for sold similar stars (grade, block, series, etc.).
Just because it is a short RUN does not mean it carries a big premium. It depends on how the BEP released them as well. Were they released as singles to replace notes in packs? These would be hard to find and probably carry a bigger premium. Were they released in pack form? Somethings they are found in bricks of 1000. These would not carry that much premium since they are available in large quantities and in sequential serial number order.
Each instance has to be analyzed to really tell and sometimes it takes a little time for the stars to settle whether they carry a big premium or not.