Best Buy offers the Microsoft Wireless Mobile Mouse 4000 in Dragonfruit Pink, model no. D5D-00019, or Ruby Pink, model no. D5D-00054, for $9.99. With free shipping, that's tied with our mention from three weeks ago and the lowest total price we could find for either color by $8. Sales tax is added where applicable. This 2.4GHz wireless mouse features a 4-way scroll wheel. One AA battery is required and included.