What do you think is wrong with your old tank? Its just a container, and what usually wears out is the sending unit, hoses, etc. If the tank has no damage/holes, I would just pull it off and refurbish it yourself. Even if you buy a new tank it will not come with new sending unit and hoses.
You might also be able to find a local source, to avoid shipping cost, but it depends where you are located. When I lived in San Antonio there was a place called Crash Parts (now out of business) that had lots of GM body repair parts on hand and there was no additional charge for shipping. For example, I think I only paid about $50 each for new Chinese-made fenders, and they are still on the truck after about 15 years.
Bruce
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