[Christ]

They're going to rip you off.

Down below, we will see that the lowest quality of Industrial Hydrogen was sold for around $42 per K-tank (per pound) in 2003, which actually represents a fairly attractive pricing! (Note that meant that in 2003, the two pounds of Hydrogen necessary to have the same amount of chemical energy (126,000 Btus) as one gallon of gasoline would have involved TWO K-size tanks and cost around $85!) In 2006, the price was still about the same for a K-tank of compressed Hydrogen. This price is in a DELIVERED form, of standard high-pressure tanks, called K-size tanks, which is how one can buy one pound of Hydrogen gas at a time. However, in really large quantity, such as full (very high pressure) tanker truckloads, the recent price publicized is generally around $3 to $5 per CCF (hundred cubic feet) of Hydrogen, but that price is FOB, meaning that the cost of freight shipment in such a truck is added on. The point here is that there is an extremely wide range of possible costs for Hydrogen gas! Proponents of Hydrogen always cite the $3 to $5 per CCF, which means $6 to $10 per pound (200 cf) of compressed Hydrogen gas, or $12 to $20 for enough Hydrogen gas to contain the equal energy as one gallon of gasoline. But after the freight is added, and then the handling and storage charges of a local industrial warehouse, even under these BEST conditions, the final price of the Hydrogen to the customer seems certain to be at least $40 (for enough Hydrogen to equal the energy in one gallon of gasoline.) The promoters and salespeople never seem to mention this, but even if relatively few middlemen try to profit from handling the Hydrogen, it is hard to see why many vehicle owners would be willing to pay $40 or $85 to buy enough Hydrogen to replace a single gallon of gasoline.

From: Hydrogen as a Fuel for Automobiles and Other Vehicles

(Emphasis is mine.)