Costco is selling a 512GB Lexar Portable SSD (SL100) for $124.99. That’s an odd product since the SSD really shines as an internal drive. For an external drive, I’d rather pick-up a large capacity external hard drive than a bunch of smaller capacity SSDs.
There are quite a few listings on Amazon and eBay reselling this unit for a lot more. And all they show is the cardboard placeholder from Costco.