Baby Center has a twin pack of reuseable swim diapers in two colors & all sizes available for $5.50 a pack plus FREE SHIPPING. I bought one set in the Bubble color for Madison and one in the Seablock for Blake. As much as we go swimming at the Y, I know these will come in handy.
Also if you go through ebates (link in my favorite links section), you get an extra 4% cash back. But if you got through Ebates, make sure you put me as your referal, email@example.com. You get a $10 gift card for signing up and making a purchase and I get a fun little incentive as well.