People who expect this to drop in value are delusional.
This is what will happen: it will sell out very quickly on their website too. There will be some weeks/months with people reselling it at the inflated prices we see now (no clue how much but 1600-1800SGD last time I checked). Some people will (more or less rightfully) act outraged.
Slowly the ones on sale will be grabbed, it will become harder to get even at inflated prices and start climbing some more in value.
Then next year closer to release the Deadpool movie will come out, hype will start again, and again when it's released, spiking the value even more.
Unless some affordable alternative is announced (like a PF), it will be Magneto again. I remember when people kept saying "it's just the hype, soon you'll find Magneto for retail".