What is a dollar bill with a star at the end of the serial number worth?

Answer 1

The following is from the US Bureau of Engraving and Printing:

When an imperfect note is detected during the manufacturing process after the serial number has been overprinted, it must be replaced with a new note. A "star" note is used to replace the imperfect note. Reusing that exact serial number to replace the imperfect note is costly and time consuming. The "star" note has its own special serial number followed by a star in place of a suffix letter.

The serial number of the imperfect note that was removed is not used again in the same numbering sequence. Collectors are generally willing to pay a premium for a star note, but very few of them are worth more than a few percent above the value of a normal bill.