YI is taking Prime Day seriously with actual discounts, unlike many of the MAP-obsessed more famous iLC camera manufacturers. Their YI M1 with 12-40mm Micro Four Thirds camera is now on sale for $299 instead of its regular price of $350 in the silver or black color schemes by YI with the orders fulfilled by Amazon, so they are Prime eligible.
Their two other kits are also discounted (two lens kit, or with 42.5mm f1.8 instead of 12-40). The best bang for the buck is the YI M1 with 12-40mm and 45mm f1.8 for $379, so essentially $80 more gets you the 45mm f1.8 lens added to your bundle.
+ these are open to everyone, they are not restricted to Prime members!