The cheapest option is to solder the leak if it is confined to one location.
I looked at alternatives.
A/ replace with a new car matrix (radiator) by Nissens but I didn't find one suitable.https://nissens.com/en-gb/automotive/heaters.aspx
B/ get it remanufactured by a auto radiator repaired.
C/ find a used one.
D/I soldered mine with plumbing tools.
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