Depends on where the crack is.
When mine cracked I had it looked at and it could be repaired but it was cracked at a seam and went part way around drain hole.
It would have cost me about, unable to get on the ground and get back up, $400.
So I had one made, square this time. When I had it installed I had straps to support all the tanks. No straps were installed originally which allowed the tanks to bounce, thus the crack.
It cost me just over $500. Would have cost over $1500 and take 4 weeks instead of 2 weeks. I picked it up and delivered.