Just fyi, the device at that link is currently showing $9.62 for a single unit, once logged in and the one-time-only "Welcome deals" are eliminated. But AliExpress pricing can vary hour by hour based on seller, inventory, algorithm, RNG.
I just bought one for $1.07 US with free shipping. I was buying with a new account so I probably got that discount. But even so, before buying I got $2.99 the first time I loaded the page, then $9.89 or thereabouts, and finally $0.99 (which I bought, it had an additional $0.08 in fees for $1.07 total). We’ll see if it shows up and is hackable, but at that price it feels too good to pass up the chance.
I've noticed the wild fluctuations in price as well (by $10), is there some trick to timing the RNG right? I'm guessing it's intentional to get you to keep refreshing.