brianabrad:We got our pad at Target and a cover from Wal-Mart. I think most pads are a standard size and same with the covers.
We got the cheapest pad BRU had and two covers from Wal-Mart ($11/each) because I just couldn't fathom spending >$20 on something that would be covered with poo soon. I was a little nervous they cheap covers wouldn't fit, but they're perfect, and as a bonus plus, they fit the Co-Sleeper Mini perfectly too, so I'm getting another for a backup sheet for that.