Even for cars that have copper brass construction it is usually cheaper to recore. The newer almuminum radiators that are comon on late model cars it is cheaper to just replace that to fix. A couple months ago I had to replace rads in my 96 and 02 sevilles due to a little stupidness in the driveway and garage and found that there isnt even a cost effective way to replace just one plastic tank on a aluminum radiator.
A few years ago I switched from dual core rads in a couple cars to 4-core rads and there it was cheapest to buy the tanks and core seperately (most stock single/dual core tanks will only accept up to 3-core core usually) and have them assembled for me.
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