possible. though I haven't seen any at my goodwill (which gets the clearnace from several targets it seems).
Found a DS Wifi adapter ($10), Wiimote ($10, broken, but Nintendo replaced for free) and 2 copies of C&C 3 ($3 and $8) all in the last month. But no XBL cards.
"It is terrible to contemplate how few politicians are hanged" -G.K. Chesterton