Best Buy offers the Logitech M510 Cordless Optical Mouse in Blue, model no. 910-002533, for $19.99 with free shipping. That's the lowest total in-stock price we could find by $15, although we saw it for $2 less two weeks ago. Sales tax is added where applicable. This wireless mouse features a nano-receiver, ergonomic design, and more. Two AA batteries are included.

Not a fan of blue? Amazon offers it to its Prime members in Light Silver, model no. 910-001822, for the same price.