The price is too high for your la 90 considering the difficulty goes up everyday even if you ship by 15th may and customers receive by 20th may it will take them 3 months to make the money back they paid for the miner let alone profit. I suggest a price drop as many sellers are selling this same item from
http://www.innosilicon.com/ all around even on alibaba.com.
If you can re consider your price and guarantee a working item with the warranty as you explained I might be able to get many people to order this even a group buy.
Anyone can grab the A2 image from the website and say I can deliver at what date, blah blah blah. I am from Gaw Miners and we are the biggest reseller of Gridseed. Now Gridseed told me today that they have 25 unit soon and through the month of may will only have about 100 of these. Given that Gridseed has inked an exclusive deal with A2 then what stock do you think that anyone on this forum will actually have. Probably only samples and unstable betas. Gridseed has been successful for only one reason - they deliver. And they never sell futures. When they sell at most they are a few days away from having stock.
And Jack you say you can ship hundreds of this, that's an outright lie. A2 will be in low quantities for the month of May. Production plans are not even in place for ramping up.