All-time low according to PriceSpy for the Alpha, and a pretty good price on the other two (Cloud II and Stinger can be found for the same price at various stores currently).
Cloud Alpha (black): $84
https://www.mightyape.co.nz/product/hyperx-cloud-alpha-black…
Cloud II (red): $99
https://www.mightyape.co.nz/product/hyperx-cloud-ii-pro-gami…
Cloud II (gun metal): $99
https://www.mightyape.co.nz/product/hyperx-cloud-ii-pro-gami…
Cloud Stinger: $55
https://www.mightyape.co.nz/product/hyperx-cloud-stinger-gam…
Cloud II $99 at 6 stores:
https://pricespy.co.nz/product.php?p=2983517
Cloud Stinger $54 at 2 stores, $55 at 2:
https://pricespy.co.nz/product.php?p=3886310