Seems that Bitmain changed their coupons list for me.
Now I may propose 4x BITMAIN AntMiner S3+ 50 USD Discount Coupons.
0.25 BTC for ALL 4 Discount Coupons! Or 0.075 BTC each for AntMiner S3+ discounts.
You can use one coupon for one miner.
How much for each coupon?
Can I use it all at one miner? or it was use 1 coupon for 1 miner?