there are a few aftermarkets that are cheaper, but not sure if they are worth it...i figure with gas prices and the miles we drive, it's worth it every 2 years/40k miles.
and for you Acura, rockauto has two I'd trust, both under $4! Beck-Arnley and AC Delco.
and to those that say "if it rattles it's fine" OMG, you're kidding right! oh wait, you really do believe it.