All are external (internal 18 TB drives were more costly).
Best Buy: $299.99
https://www.bestbuy.com/site/wd-easystore-18tb-external-usb-3-0-hard-drive-black/6427995.p?skuId=6427995
However, none are available in my area for pickup, nor for shipping. I do not understand why “shipping” should have a limited area (domestically). So this sale price has no meaning – unless Best Buy actually does have them available somewhere.
B&H Photo Video: $299.99 (after coupon is applied – happens automatically at checkout)
https://www.bhphotovideo.com/c/product/1604997-REG/wd_wdbwlg0180hbk_nesn_wd_elements_desktop_18tb.html
There is a limit of 2 per order. But I suspect that you can just place an order, and then repeat, if you want more than 2.
Again, the advertised price is $339.99 (perhaps they are not allowed to advertise below that price, due to legal mumbo-jumbo with WD?). But at checkout, you pay $299.99
I am a bit disappointed. I was expecting to see better deals, today.
Perhaps Cyber Monday will be better. But I am not holding my breath.
Cheers!