Oh, and you need to use the 23x24 size in the pad holders. I find the fir perfect. I also buy irregulars sometimes from eBay or a couple other people here:
Pee Pads For Cheap - Great For Puppy Potty Training http://www.newpuppypads.com
And the only place (haven't found a better deal)I buy cloth pads from I get here:
Used Waterproof Pads
I buy them used only and I even get stained ones, I don't care..lol.. I do have ones with no stains for in front of the doors because I cannot have rugs or they get peed on. So the pads work great for a wipe mat or a pee pad
They have new ones too
Whelping Boxes, Supplies, and Training Pads. Purchase directly at EZwhelp.com