eBay has the Moda Essentials Revenant Men's Designer Slip On Loafers (Several colors) for $25 with free shipping. Available in sizes 8 to 13, although not in all size/color combinations.
eBay has the Birkenstock Women's Gizeh Slip-On Sandals (Black or Onyx) for $62 with free shipping. List price: $130. Features cork and latex footbed, flexible EVA outsole, adjustable buckle for the perfect fit.
Amazon has the Kenneth Cole Reaction Girls' Missy Skyline 2 Shoes (Black) for $7.99 with free shipping for Prime members or on $25+. Features manmade, rubber sole, synthetic metallic lining.
6PM is offering Up To 80% Off Women's Designer Summer Slip-On Shoes. Shipping is $3.95; get free shipping on $50+ or when you buy at least two items. Brands include Calvin Klein, Coach, Michael Kors, Nine West, and Tommy Hilfiger.