I've been a member of a credit union and I've gotten probably 6 auto loans through them and they're always the best. Granted I've got excellent credit now, but I could have gotten 4.49 x 48, 4.99 for 60, or 5.49 x 72. I went with the longer one for now. smart promised they'd beat it. Well, they offered me .1% better, but for the convenience of keeping my auto loan at my credit union, $.20/mo was worth it.
Find a way to join a CU... you won't regret it! (and don't say "I'm not eligible." There's always a way to find a connection to someone who's in one, or if you're an alumnus at a school, or through your employer, or through a friend... you can do it....

)