Try Aliexpress.com, search for Gridseed.  Just got one, hope to do it again in a couple more weeks.  Really, I got what is supposedly a used G-blade for $62 including shipping.  Got it in about a week.  Everything tells me it's from 2014 but it doesn't look used, might be new old stock.  Very happy with it so far, glad I didn't get some newer smaller stick miner.  Without pushing it hard it's been doing 4,496 kH/s for maybe 18 hours so far, running at 700 MHz.