Also this seems interesting.. In August another 3TH might not be worth all that much though.
Posted 4/28/14
Neptune is KnCMiners first 20nm product. It features a minimum of 3,000 GH/s (aka 3 TH/s) of hashing speed, five times faster than the companys most recent bestselling miner, the Jupiter. It also boasts a 30 percent reduction in watts-per-GH. Thanks to KnCMiners offer, each customer who ordered a first or second batch Neptune, will get a minimum 6TH for each order, with their original 3TH product shipped in June and the free third batch machine delivered in August.
https://www.kncminer.com/news/news-87