I have a skywatch processor (no antenna) and KGP 560 for sale.  Both were removed from my aircraft when I installed my Lynx in June and both were working when removed.

Price:

Skywatch: $1100

KGP560: $500 (the KGP560 database update was done 3-4 years ago so is newer than the plane)

Shipping in the US included, but will ship overseas at cost.

Please let me know if you have any questions.