128GB Lexar SDXC C10 (400x) for $51 (64GB for $28)

The 128GB Lexar SDXC Class 10 UHS-1 400x memory card is currently going for $51 with free shipping, with a limit of 30 per customer at Amazon by Amazon itself. In parallel, the 64GB version [corrected link] goes for $28 with a limit of 30 per customer. The usual Amazon free shipping applies, free 2-day for Prime members or with a $35+ order for non-Prime member. This is not part of the lightning deals.