Check the auction site. There are several. If you are goig to keep the car for a while, there are all aluminum for less than $200, or replacments for less than $120.
Well, stock is aluminum with plastic tanks bonded to it, so they have different expansion and contraction rates and sooner or later they will separate.
I used the guys below with no problems on my DD. Had it the next day, nothing fancy just a stock replacement. There are several internet companies that share the same warehousing setup and the rads all come from the same place (manufacturers).