Fingerprint reader to open electric strike

Awesome. Now if I think I might buy a different electric strike, as this one is pretty expensive. The one I'm looking at now though is a 12V DC, with a current of 450 mA. Will I need to purchase a 12V DC wall supply that is rated for 450 mA, or can I exceed the limit at all? I'm finding it tough trying to find a company to buy the strike and power supply from for an affordable price.