QNAP's four bay unit with an Intel N5105 processor, dual 2.5GbE ports, and two M.2 NVMe slots for caching or a separate fast pool. The hardware specification beats Synology at the same price. QTS is less refined than DSM, and QNAP's security track record has been rougher.
Across 3 listings tracked in the last three days, the median total cost in USD including shipping is $775, and the lowest is $620. RackSniper flags a listing once it falls at or below 70 percent of the trailing 30 day median, which for this product means roughly $543 or less. Condition and configuration vary widely on used enterprise hardware, so treat the median as a reference point rather than a target.