>>4 and
>>5 I managed to find them all in stores for me, as most of wave 1 I got in stores.... being Mario, Pikachu (really easy to get online at JB-hi-fi), Link, Yoshi (got them basically day one and two), DK and Kirby (those two are getting easier in Australia now, as we were just re-stocked with Amiibo, but if you want the Aus/NZ boxes, or PAL boxes, you're out of luck, as we only have JP boxes now, but I believe you can find Kirby and DK online at EBgames). With wave 3, I came late to Target's 8am opening to find out that there were only four Amiibo left, being 2 Bowsers and 2 Sonics. I then rushed into Big W at it's opening to get as many as I didn't have as possible, so I got everything but Lucario and Shulk (accidentally grabbed two Rosalinas, Toon Link and another Sonic, xD). I was one of the lucky ones who was able to pre-order Lucario (before I knew how rare they could be), but missed out on the best Smash Bros Character ever, Shulk. I guess I wasn't really feeling it for Shulk (I'm not sorry). The rest I managed to find really good deals for online.
If you live in Melbourne, then there's a shop called Critical Hit on Little Collins Street which I've heard has a small supply of Amiibo for a slightly higher price. Here's the website, if needed:
http://www.criticalhit.com.au/index.php?route=common/home
If you're looking for Amiibo from other areas of Australia for.... somewhat good prices, you may want to check out these websites:
http://www.ozgameshop.com/search/amiibo/sort-relevance
http://search.dungeoncrawl.com.au/search/keywords-amiibo
If you can't find the ones you want on those websites, while it's expensive, try this website:
http://www.play-asia.com/paOScore/19-71-99-15-amiibo.html
Otherwise, eBay is a last resort, if needed.