If somebody charges you more than $100.00, they are gouging you.
Once the tank is out and purged, welding it should be a minor task. It is not a problem to insert a hose into the tank, from the same argon bottle they use for the heliarc setup needed to make the weld, flood the interior of the tank with argon, and first, grind out the crack until they have clean metal, then second, check for lack of oxygen in the tank, then third, weld up the crack.
It really isn't a complicated or dangerous job and the weld SHOULD be better than the original.
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