Yeah you can get them cheaper than $70 on eBay, just depends on what you want (aftermarkets can be added for $30-40 plus the kit). But I would guess there is some odd random issue somewhere if things are going bad like that. Car is around seven years old now, any other issues with it (the first batch or year or two in of a new model usually has more problems than the same car that has been made already for several years). A lot of people avoid cars in their first model year so the maker can "sort" out the problems. But if that is all that has gone out in seven years, that is not too bad. How many miles are you at? I am guessing 120,000?