Razer makes them with input from Lambda Labs, a deep learning company that hosts cloud GPUs and supports onsite builds as well. Lambda provides support and have been very helpful the few times I've needed to reach them. Base model (Linux) is $3.5k with a year warranty, $4.1k for the same with a 2 year warranty, and $5k for a dual Linux/windows machine that has a 3 year warranty. All machines have the same specs, so it's really support/warranty you're paying for.