I want to buy CEX.IO gh/s. I will pay you $4.5 per 10 gh/s; the most i will buy is 100gh/s. I want to use these for mining; I'm not going to be trading. I will pay you using paypal.
Find some one who is willing to trade your paypal usd for Bitcoin, and then buy ghs directly from cex.io
People won't sell you any ghs for the price you offer, if they want to sell them, they can sell them directly at cex.io for much more.