[quote name='Lone_Prodigy']I've pretty much given up on getting MPT for anything under $20: I'll just wait for the Wii version.[/quote]
Mario Power Tennis and the Mario Baseball game are pretty much the only Gamecube games I wish I could get these days, but neither one are at a low enough price point for me to feel like I can buy them. Likely, when the Wii Mario baseball title is released, we'll see a drop in the Gamecube version, simply because more people will be of a similar mindset to yourself, Lone_Prodigy. Still, even though I too have given up for the time being of getting Mario Power Tennis, I have hopes to score it at some point, perhaps from Goozex.
Wanting a tennis experience, I started Sega Superstars Tennis on the DS, but I don't think I can stand it. I think the game would likely be more bearable on the Wii, but the graphics are icky and the powershots are ridiculously hard to counter, at least in my initial impression.