I'm pretty sure it isn't the same Mario Advanced game that he was referring to... I havn't seen it very cheap, it was $30 at BB when i checked yesterday. Idk the best place to get the game, but if your looking for a guide, I have one on my Game Guide list. good luck.
I sell the game for 17.99 used at my store and have 1 copy left if you are looking to buy it. shipping would be like 2 bucks or less if you wanted insurance. www.gamersoasisonline.com is the store page