Well... I use the disposable ones - though the cost for those can add up. So now, I too am interested in the washable ones. I believe I saw some at Petsmart online, other than that I dont know other stores to buy them at.
We've pad trained Meka since day one (9 wks). Many accidents since then, but now at 8 mo's she's great with em'. We just moved her bed upstairs, and she's had no prob's going downstairs to her room (washroom) to use the pad. And when we take her out for walks, she naturally "goes" outside (we never really "trained" her to do that). Its been working great for us