Blockbuster Video stores do often sell used video games such as Gamecube games however, they don't sell used Video game hardware such as the console itself.
You cannot buy an Action Replay Gamecube or GameShark for Gamecube anymore as they no longer support the Gamecube or its games and accessories, However, You can still buy these from Amazon, Ebay or possibly a pawn shop (Pawn shops sometimes have Gamecubes and Gamecube Accessories)
Yes, of course it will.
Yes because Nintendo is a japanese game company and that is where all the Cube's game was made at so the short answer is yes -THErealREDheadFRED
Gamecubes are not collectable and probably never will be. The system had few iconic games unlike the NES or the N64 which are iconic systems. But you never really know if the GC will become collectible.
If it is a Japanese Gamecube, then do you think it can play Japanese Gamecube games?
NINTENDO stopped making GameCube games because the Nintendo Wii has a compartment on the top that you can insert GameCube controllers and memory cards inside, so many people sell their GameCubes for the Wii. Also, NINTENDO wants people to switch over to the Wii from GameCube to make money and so they have the next-gen game, so for those reasons, they stopped GameCube game production. They still make memory cards and controllers for the GameCube.
Not at present day times, considering you can use the Wii console to play Nintendo GameCube games on it...but, I still enjoy to use the GameCube every once in awhile, and it's not really worth anything so I wouldn't recommend selling it for a higher price.
Stuff like gamecubes and computers.
No, the Wii is region locked, even down to Gamecube compatability. A UK Wii can only play UK Gamecube games.
It should be able to. If a game boy from America can play Japanese game boy games, your German game cube should work with American games.
No. A Gamecube controller is required for all Gamecube games.