There are pre-orders available, but only if you have a little money to spare.
KB Toys has opened its GameCube store for business. The systems are available in $399.99 bundles, not unlike Amazon's deal. But featuring only three games (varying with the package chosen) along with a memory card, there is a significant amount unaccounted for (around $35). You can also buy the jumbo package, which includes seven games, a second controller and a memory card for a whopping $649.99, which is $50 above the expected price.