Staples offers the Thule En Route Strut Daypack, model no. TESD-115, in Black for $32.99. Plus, Staples Rewards members receive free shipping. (Not a member? It's free to join.) That's the lowest total price we could find by $6, although most vendors charge $80 or more. It fits the 15" MacBook Pro and 10" tablets. Deal ends April 24.