I acquired my Dimension in a straight up trade for a GTB Melody,
which i thought was very fair,
since both games are fairly rare and were in comparable condition.
I did not care for Melody much, as you had to lose/drain balls
in order to light the AAB features.
The drop targets on Dimension is just more fun to play and easier to earn AABs.
Either game probably could command from $1000 to $2000
depending on condition and region and how much a buyer wanted the game.