Pee pads are really expensive when you add it all up. My husband decided to purchase the WizDog indoor potty about 2 days ago and it's very convenient and cheap. You don't necessarily have to use a pee pad because there's a "grate" that separates the newspaper (or pee pad if preferred) from the tray and plus you won't get footprints all over your floor/carpet.
www.wizdog.com
(it's a lot cheaper on eBay)