I recently bought one from kaboomracks.com (excellent service from these guys), not for lottery, but for to show regular mining to help with orange peeling customers, friends, relatives to better explain the concept in general, repeat NOT to try the lottery.

Using viabtc.com only making pennies, but great for learning, showing the basics in hooking up etc.

Shout out to @KaboomracksAlex

I also purchased a S9, cables and other stuff from these guys, excellent service.