Its hard to give exact figures because the prices depend on many factors like purity, impurities, delivery pressure if by pipeline, number of cylinders if by cylinders or racks, the process used to produce it, delivery in liquid form and vaporized for the customer, contractual agreements, long term buying contracts, the method used for further purification for example if the gas was from a psa process initially and many other factors.
Suffice to say, the price would depend quite alot on whether the customer is a large dedicated customer or one small time customer. The selling price would be calculated mainly from how much it costs to produce and transport it.
There isnt exactly a fixed price too. For example, a corporate sales guy knows of a company who wants to buy the gas. He and others from other companies goes to the potential client and pitch their points, not just on price but on stuff like reliability, purity, goodwill etc. The client selects the one he thinks most suitable and a price is negotiated with the sales guy based on his knowledge of the cost of production and delivery of the plant or plants and network. Every company gets a slightly different price.
Of course, there is a sort of market price which is what those small time customers will see but the fact that you gave your query with those specs seems to imply a large dedicated customer by pipeline delivery.
The current market price is hard to track because they arent traded like on mercentile exchanges and companies keep it secret since evidently they are price sensitive...
My best suggestion, email the companies and inform them of your intent and they may tell you.
Edited by thorium90, 30 April 2013 - 07:49 PM.