eBay has the Crocs Women's Waterproof Chelsea Boots (Black or Dark Green Camo) for $23 with free shipping. Available in select sizes from 5 to 9.
Amazon has the Camel Crown Men's Athletic Shoes (Blue/Orange or Dark Gray) for $39.99 - $18 off with coupon 45OFFSHOES (Ends 1/18) = $21.99 with free shipping. Available in sizes from 8 to 11. Has good Amazon Reviews.
eBay has the Dockers Men's Kenworth Oxford Shoes with NeverWet (Brown) for $33 with free shipping. Available in sizes 7 to 13.