How much should I expect to pay to replace the

Is the joint where the crack is copper to copper or copper to aluminum? With this being a Carrier, it could be either. If copper to copper, it can be re-welded (repaired) with no problem. If copper to aluminum, there is an epoxy on the market that will repair it if it's not to big. If it's to large of a leak, you will indeed have to replace it. A word of advice. I you do replace it, don't let the contractor sale you another aluminum coil unit.
I'm not sure where you are located so this price may be more or less. Although it should be in the ball park.
It looks like what you have is a 5 ton unit by the model number but I'm not sure if it's a heat pump or not. Plus I'm not sure how old it is so I'll give you a price based on these facts.
Your unit

1. being a 5 ton unit
2. an older unit with R22 Freon
3. Being straight air (Not a Heat Pump)

If your contractor will replace the unit with one with R22. (No more made after 01/01/2010.) I would charge around $2800. If the contractor can't find or will not look for a R22 replacement they will have to replace not only the outside unit but also the inside coil. For this I would charge around $3800. To replace the complete system with a 13 SEER ( R410A unit) I would charge around $5200. The difference in prices I gave is if you wanted a YORK or a Goodman. A Goodman will be around $1000 less than a YORK. The most expensive brand on the market is a TRANE. I'm a YORK dealer and to be honest with you, a Goodman is just as good and does the same thing as any of the other brands. They also offer from a 13 SEER to a 16 SEER. YORK offers up to an 18 SEER as well as TRANE. If your unit is not more than 8 years old, I would only replace the outside unit myself but I assure you that the salesman will advise you to replace the whole unit. This is what they get paid for and that's were the company stands to make the largest profit. There are companies in my area that will tell customers that coils can't be repaired. That once they leak, they have to be replaced or at least the coil.
Just be smart and do not let the service company sale you something you do not need.Good luck. Sorry to be so lengthy. I'm just trying to give you as much information as I can and I hope it helps you make a wise decision, not a costly one.

i would say less than 3000, '
for a condensor replacement only
figure in the cost of the unit plus 2-5 hours of labor
and then of coarse the refrigerant
ive done this exact job several times
and the highest final bill
just about 2200
but it depends on the markup in your area
on the unit, refrigerant, new copper,