You don't give a year for this Prodigy...
The last Prodigy made with chromoly steel was back in 1995. Back then the bike sold for about $585.
If the bike is in mint condition and has new Alivio brakes, it would be worth $173. In fair condition, it would be worth about $110, on today's date (6/8/2014).
The Prodigy had an RSX groupset, which would be the equivalent of today's Tiagra gruppo. The Prodigy's crankset is RSX 26/36/46.
Last edited by WestPablo; 06-08-14 at 06:33 AM.