Mwave offers the Bushnell Falcon 10x50 Wide Angle Binoculars, model no. BUS-133450, for $35.32 plus $1.99 for shipping. That's the lowest total price we could find by $3, outside of the mentions below. It features a 300 foot field of view, instafocus lever for rapid focusing, and case.
Close prices: Olivabel via Amazon has it for $37.85 with free shipping for prime members. Focus Camera offers it for $39.99 with free shipping.