[quote name='UncleBob']Quick. made-up reference numbers...
When GameStop wanted to buy EBGames, part of their legal defense was that they'd only control less than 10% of the Video Game Market, in contrast with Walmart who, at the time, controlled ~35%. Let's say each Walmart store is getting 30 copies of this game. 70,000 games for Walmart. At 35% of sales, that makes for ~300,000 copies.
Some numbers for comparison:
Super Mario Bros. for the GBA (NES Classics edition, with no graphical upgrades, no 2, 3 and Lost Levels, no book, no music CD, but $10 less) sold 876,000 copies during it's lifespan. A niche title, indeed.
The Wii has sold (estimated) 35,910,000 units. At 300,000 copies of the game, that would be approximately one copy for every 120 Wiis.
New Super Mario Bros. Wii, the closest Comp Title, sold 550,000 on "Day One" in the NA market. And it was a $50 title.
Impossible to find? Probably not. Stroll into Walmart Monday afternoon for a copy? Maybe... if you're lucky.

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GBA? NSMB? You're kidding, right? Compare apples to apples at least. The re-releases on Wiiware sold 150,000 for the first game, 70,000 on the second and around 125,000 copies of the third game in the first full year of sales in the US. That's probably the reason Nintendo is only pressing a few hundred thousand copies of this compilation to begin with. The games appeal to nostalgic gamers and collectors, but not the average young family with little kids. The only reason this is being released over here is that it was cheap to do and it's fan service. Nintendo is not expecting this to sell millions of copies nor will it. The games are widely available in various versions and many of us already have them, but are buying this anyway. It's a neat item that most of us will play occasionally, but it's not the kind of thing that kids are going to demand their parents line up for at Toys R Us come Sunday morning.