Macy's offers the O'Neill Men's Calypso Stripe 21" Boardshorts in Yellow for $17.73. Pad your order with a beauty item (they start at $4) to bag free shipping; otherwise, shipping adds $10.95. That's the lowest price we could find by $18. They're available in sizes 31 to 44.
Street Moda via eBay offers the Lacoste Men's L30 Leather Flip Flops in several colors (Light Blue pictured) for $54.99 with free shipping. That's $10 off and the lowest price we could find. They're available in select sizes from 9 to 13.