Amazon offers the Logitech MK260 Keyboard & Optical Mouse Combo, model no. 920-002950, for $17.77 with free shipping. That's the lowest total price we could find by $8, although we saw it for $3 less two weeks ago (for in-store pickup only, since expired). The keyboard features a spill-resistant design and eight hot-keys, while the mouse features 1,000 dpi optical tracking.

A close price: Walmart has it for $17.77 plus 97 cents for shipping (or choose free Site-to-Store). Sales tax is added where applicable.