IOGear GKM681R 2.4GHz Compact Wireless Keyboard with Trackball for $24.99 shipped. Here is a screenshot for your reference. Alternatively, it is available at Amazon for the same price with free shipping on orders over $25. This is a 2.4GHz wireless compact keyboard with built-in optical trackball and works well for a home theather PC (HTPC). Most places have this wireless keyboard with trackball for about $37.