The only GameCube that could play CDs and DVDs is rarely found below $1,000 today - Engadget
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The Panasonic Q GameCube was a hybrid GameCube and CD/DVD player. Very few were sold due to the PS2's similar capabilities, but that makes the Q worth more now.

The weird, rare Panasonic Q GameCube was a hybrid GameCube and CD/DVD player. Very few were sold due to the PS2’s similar capabilities, but that makes the Q worth more now (of course)