One of the places I regularly buy from is Directron in Houston. I know they use Linux on the back end, like a lot of place, but you don’t see much about it on the systems they sell other than servers. When I stopped by today they had a really nice Pre-built Linux system on sale for a really nice price with Ubuntu 16.04 pre-installed. The fully loaded system with an SSD, extra hard drive and Nvidia 970 costs around $1200 which is almost $700 less than a similarly configured Dell. Nice.