Amazon.com has the Fossil Abacus AU5005 Wrist PDA with Palm OS - Black on clearance for $49.99 while supplies last. Free shipping is also included. Check more than just the time with this Wrist PDA watch, a revolutionary personal organizer cleverly disguised as a stylish wristwatch. Powered by the Palm OS platform this watch can store hundreds of contacts, check your calendar, and make a To-Do list from its surprisingly big 8 MB of memory.