In case you need a DL box with 8 GTX 1080 ti cards... ;-)

I’ve been looking at options to put together my own build and it’s very similar to their “Single” model (except with 2 GPUs). For the same price you can buy more powerful components than what they put into the machine. (Of course, you’ll have to put all the parts together yourself.)

Very costly for learning

This is the machine I built and have been very happy with the performance (I also use it to play games):