om3gaboost

i have a 99 i30 and i am looking to purchase a cd changer. i don't know much..but from what i have seen..there are few or none in the market that can work with the stock system. crutchfield has one for like 300..and infiniti-parts.com has one forl ike 180. iwas wondering, what other options do i have..and if u guys know if infiniti-parts.com is legit or not.
thanks