If you've been collecting the new Mario series Amiibo in North America, your only option to complete the set was to buy the Mario Party 10 bundle. Mario himself was exclusive to the bundle, unless you managed to score one of the ludicrously rare gold Wal-Mart exclusive Marios.
Well, according to a tweet from Nintendo of America, gamers in the states will be able to buy the individual Mario Amiibo starting April 3rd. To be honest it wasn't a huge deal considering the plentiful Smash Bros Mario Amiibo worked just fine with Mario Party 10, but I understand it was an annoyance for collectors. Stay tuned for my full review of Mario Party 10.