On average a hire car from National at Sydney airport costs C$ 89 per day. However, you might be able to find rental car deals as low as C$ 82 per day which is a 18% difference from the highest price per day at C$ 99.
If you're flying into Sydney airport, the closest National car rental location to you is 280 Silver Dart Way, and they can be reached on +1 902 539 1303.
Yes, National offers shuttle services from Sydney airport (YQY).