Well, it had to happen. The eBay run-up on the Sidekick 3 is now reaching ridonkulous proportions, with some folks paying $4,050 for a hunk of electronics. Heck, I'll bet Sharp, the SK3's manufacturer, paid that much for their R&D—"What should we do?" "Well, let's stick a trackball on there! And make it smaller!" "Score!"