Amazon offers the Adesso Wireless Mini Trackball Keyboard in Black for $47.56 $47.96. Clip the 75% off coupon on the product page to cut the price to $11.89 $11.99. With free shipping, that's the lowest price we could find by $36. It features a battery low LED indicator, 30-foot wireless range, and 800dpi optical trackball sensor. It requires two AA batteries (included).

Note: This item is temporarily out of stock, but can still be ordered at this price for delivery when available.