Did I strike Gold? Or silver? Or Bronze?

[VGC-Rare]

I bought this stuff off eBay earlier today

What's their value and rarity?
Did I get a good deal?

Dance Dance Revolution Mario Mix w/mat (Brand new in box, Japanese version) (paid 40)

Intel GameCube sound system (New in box) (paid 40)

Rockman EXE Transmission (New in box, Japanese version) (paid 10)

These are all GameCube games

Thnx

[Mana]

Dance Dance Revolution Mario Mix w/mat (Brand new in box, Japanese version) (paid 40): You got a good deal, usually they go for double then that

Edit: See This Auction

Intel GameCube sound system (New in box) (paid 40): Not sure about the price of this one

Rockman EXE Transmission (New in box, Japanese version) (paid 10): I think it's a good deal considering its brand new in box. A few months back I bought one for $10 but it was used condition