I recently bought a game called "Shantae" for the gbc while looking online i saw somthing that said there were only 13,000 copies in existence. further reasearch showed that a copy of the game runs for around 100 dollars!(this suprised me because i bought it for 8 dollars) however my problem is that NONE of these sources are reliable. does anybody know if this is true? and if possible can you give me a link to a reliable source?

also on a side note: what happens if I collect all 12 fireflies?