http://www.bemoneyaware.com/blog/how-much-to-pay-for-lpg-cylinder-how-much-lpg-subsidy-i-will-get/

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The cost of this cylinder depends on the cost of two key components:

1) The carbon fiber what is used for making the cylinder walls.

2) The liner material inside the cylinder and whether is liner is made of stainless steel or high-density polyethylene (HDPE).

On average, I would say the cost could range from $750 US dollars and up to $2,000.00 US dollars.

Hope this helps answer your question.

Professor Yehia Khalil

Yale University

USA

The below pdf will be more helpful