Went to Play 'N Trade to see how much they'd give me for the following games:
Advance Wars: Dual Strike (DS)
Mario & Luigi: Partner's In Time (DS)
Mario Kart DS (DS)
The Legend of Zelda (classing NES series) (GBA)
Megaman Zero 4 (GBA)

So how much cash were they willing to give me for all these great titles?

Spoiler warning:
$20


Needless to say, I didn't take it, I could get way more than that on Ebay selling them individually. Advance Wars Dual Strike alone goes for a min. price of $30 used on amazon.com.