the 2$ is worth 2$ (even though its 1976, its very common). the star note has a run of 3.2mil - so its also common for a star note. Personally I'd just keep the star, but Im sure someone wouldn't mind it. Dont expect more than 1.25 for it though
I'd probably hang on to the star note, but I would let the $2 go without even thinking about it. As was already said, the star is common...and in that condition not worth a premium, but it's still cool.