Electro Extravaganza via Amazon offers Prime members the Belkin Fridge Mount for iPad, model no. F5L098tt, for $14.95 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $9.29.) That's the lowest total price we could find by $5, outside of the mention below. It requires no tools or hardware for mounting.
A close price: Belkin charges a buck more via coupon code "NEWYEAR20".