OP two good sites I have used:
www.alarmsystemstore.com
www.cctvcamerapros.com
For a basic IP camera the Mole at Costco or the TrendNet IP422 (they make a wired and wireless/wired model, I have the wireless one). They are about $150-200.
My security system is a DSC 1864 with 20 window/door wireless contacts, a glass break in every room, 2 smoke/fire/heat, 3 PIR's, both landline and GSM phone links, interior and exterior sirens. My home is pretty secure now. The monitoring at AlarmSystemStore.com is cheap and very fast. They call even on low battery or power outages, it's about $105 for landline and $150 if you want GSM monitoring.
Andy Bowman is the owner and a great guy, if you call him with your needs he can custom design the system that's right for you. I went a bit overboard, but since I was just robbed it was more piece of mind. He will only try to sell you what you need which is nice.