Nice score. You may search for ammo deals on Gunbroker.com, Cheaperthandirt.net, or just Google it.
Please spend some time to get to know your Glock. I don't recommend Glocks as a first time gun purchase because of the trigger design. You may want to invest a few bucks on some one on one instruction with a qualified instructor. I have seen LEO's nearly shot themselves, each other, or a perp because of improper handling/holstering of Glocks.
Don't want to scare you but just beware of the precautions....have fun and enjoy.
May the Schwartz Be With You.