yeah they can be. basically whatever the dealer's profit margin is, you save. could range from $1k - 4k.
A dealer has an incentive to buy a cheap car at auction (cheap for whatever reason - damage, wear high km's etc), fix anything wrong with it, and then sell at the local market price so as to maximise their profit. Not to say all dealers are dodgy like this, but the incentive is there.
With an import broker the incentive is for them to find the best possible car for you, as they receive a fixed fee and want a good repuation so you refer your friends.
hope this helps you decide