JackRabbit offers the Saucony Men's or Women's Breakthru 3 Running Shoes in several colors (men's Black/Red pictured) for $45.97. Plus, coupon code "BREAK3" yields free shipping. (The code takes off $7.99, the same cost as "Economy" shipping.) That's the lowest price we could find by $2, although most stores charge over $60. They're available in select men's sizes from 8 to 13 and women's sizes from 6 to 11.

Update: Price and shipping corrected.

Update 2: Coupon code "BREAK3" now cuts the final price to $41.12 with free shipping. (The pre-coupon shipping price has dropped to $3.14, but the code still cuts the regular $7.99.)