I'm having no trouble finding them this time -- I guess all the ebay sellers have moved on to other things? But there have been plenty everywhere I've been. (Except Amazon, which only lets you order 3 packs a week.) Both Gamestops I've been too had series 1 & 2 available. The amiibos have been everywhere too -- very different this time around, it was so hard to get series 1!
It seems easier this time around to me, too. Everyone now has plenty of Series 1 on the shelves. LOL. I bought 18 packs of Series 2 at Target on the day they were released and I'm going to Walmart to get a few more today.