the only thing you might be able to get cheaper in this case is if you go with a cheaper front mount heat exchanger. just get a VW one off ebay or something and that will work nicely. it just wont be the best setup you can have. you can also buy a pump and all the hosing for cheaper if you know how to shop around.

the core is the part youre never going to get around buying a good one. used are fine as long as they work and are complete.