Wow, I certainly didn't expect to be reading those kind of figures in relation to this problem, but I echo what other people are saying, have a look at the second hand/broken car market. There is bound to be a cheaper option then the prices they have quoted.
That said, I understand the fear of a never ending bill - sometimes it is right to let a car go instead of having all the horrific outlay. That is a decision only you can make, but in any case I hope you feel whatever decision you make isn't tinged with regret.
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