My advice? Quit while you're ahead. These amiibos, while nice, are just not worth the time, stress, and gas money. Nintendo failed big time (again) with simple supply and demand. To be fair, even they didn't know that these things would take off as they have. I'm trying to get a Rosalina for my daughter, which of course are exclusive to Target and sold out in minutes. The only way to get them is to pay the price-gouging pieces of sh*t ebay resellers, but I refuse to do that.
Its not really a failure though, with something like this, it was clear from the onset that there would be characters with a smaller run, hence characters appearing only exclusively at certain stores. Nintendo purposely made it a point to supply less than the demand only to increase the interest in collecting them all. Seems pretty obvious to me. If they had every character available from the start with enough supply to meet the current demand, well then the demand in that hypothetical situation would actually be less than it is now due to lack of interest in collecting them as they no longer would seem like having a complete collection would be of much value and therefore they'd see less sales than they do now, and a lot more amiibos would just be sitting on shelves collecting dust not getting bought. Seems like Nintendo probably knew exactly what they were doing when they decided how much of each amiibo to produce.